Radial velocity variability and the evolution of hot subdwarf stars

Geier, S.; Dorsch, M.; Pelisoli, I.; Reindl, N.; Heber, U.; Irrgang, A.

doi:10.1051/0004-6361/202143022

Radial velocity variability and the evolution of hot subdwarf stars

Journal Article · Sun May 01 00:00:00 EDT 2022 · Astronomy and Astrophysics

DOI:https://doi.org/10.1051/0004-6361/202143022· OSTI ID:1982328

Geier, S. ^[1]; Dorsch, M. ^[2]; Pelisoli, I. ^[3]; Reindl, N. ^[1]; Heber, U. ^[2]; Irrgang, A. ^[2]

Univ. of Potsdam (Germany). Institut fuer Physik und Astronomie
Friedrich-Alexander University Erlangen-Nuremberg, Bamberg (Germany)
Univ. of Warwick, Coventry (United Kingdom); Univ. of Potsdam (Germany). Institut fuer Physik und Astronomie

Hot subdwarf stars represent a late and peculiar stage in the evolution of low-mass stars, since they are likely formed by close binary interactions. In this work, we perform a radial velocity (RV) variability study of a sample of 646 hot subdwarfs with multi-epoch radial velocities based on spectra from Sloan Digital Sky Survey (SDSS) and Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST). The atmospheric parameters and RVs were taken from the literature. For stars with archival spectra but without literature values, we determined the parameters by fitting model atmospheres. In addition, we redetermined the atmospheric parameters and RVs for all the He-enriched sdO/Bs. This broad sample allowed us to study RV-variability as a function of the location in theT_eff - log g- and T_eff - log n (He)/n (H) diagrams in a statistically significant way. We used the fraction of RV-variable stars and the distribution of the maximum RV variations ΔRV_maxas diagnostics. Both indicators turned out to be quite inhomogeneous across the studied parameter ranges. A striking feature is the completely dissimilar behaviour of He-poor and He-rich hot subdwarfs. While the former have a high fraction of close binaries, almost no significant RV variations could be detected for the latter. This has led us to the conclusion that there is likely no evolutionary connection between these subtypes. On the other hand, intermediate He-rich- and extreme He-rich sdOB/Os are more likely to be related. Furthermore, we conclude that the vast majority of this population is formed via one or several binary merger channels. Hot subdwarfs with temperatures cooler than ~24 000 K tend to show fewer and smaller RV-variations. These objects might constitute a new subpopulation of binaries with longer periods and late-type or compact companions. The RV-variability properties of the extreme horizontal branch (EHB) and corresponding post-EHB populations of the He-poor hot subdwarfs match and confirm the predicted evolutionary connection between them. Stars found below the canonical EHB at somewhat higher surface gravities show large RV variations and a high RV variability fraction. These properties are consistent with most of them being low-mass EHB stars or progenitors of low-mass helium white dwarfs in close binaries.

View Accepted Manuscript (DOE)

Research Organization:: US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)

Sponsoring Organization:: Deutsche Forschungsgemeinschaft UK Science and Technology Facilities Council (STFC); German Academic Exchange Service; USDOE

OSTI ID:: 1982328

Journal Information:: Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 661; ISSN 0004-6361

Publisher:: EDP SciencesCopyright Statement

Country of Publication:: United States

Language:: English

References (120)

A computer program for calculating non-LTE model stellar atmospheres Hubeny, I. Computer Physics Communications, Vol. 52, Issue 1 https://doi.org/10.1016/0010-4655(88)90177-4	journal	December 1988
Radial velocity curves of nine sdB binary stars Edelmann, H.; Heber, U.; Lisker, T. Astrophysics and Space Science, Vol. 291, Issue 3 https://doi.org/10.1023/B:ASTR.0000044338.27638.9f	journal	January 2004
Close binary EHB stars from SPY Napiwotzki, R.; Karl, C. A.; Lisker, T. Astrophysics and Space Science, Vol. 291, Issue 3 https://doi.org/10.1023/B:ASTR.0000044362.07416.6c	journal	January 2004
A hot subdwarf–white dwarf super-Chandrasekhar candidate supernova Ia progenitor Pelisoli, Ingrid; Neunteufel, P.; Geier, S. Nature Astronomy, Vol. 5, Issue 10 https://doi.org/10.1038/s41550-021-01413-0	journal	July 2021
The origin of subdwarf B stars – I. The formation channels Han, Z.; Podsiadlowski, Ph.; Maxted, P. F. L. Monthly Notices of the Royal Astronomical Society, Vol. 336, Issue 2 https://doi.org/10.1046/j.1365-8711.2002.05752.x	journal	October 2002
Orbital periods of 22 subdwarf B stars Morales-Rueda, L.; Maxted, P. F. L.; Marsh, T. R. Monthly Notices of the Royal Astronomical Society, Vol. 338, Issue 3 https://doi.org/10.1046/j.1365-8711.2003.06088.x	journal	January 2003
The origin of subdwarf B stars - II Han, Z.; Podsiadlowski, Ph.; Maxted, P. F. L. Monthly Notices of the Royal Astronomical Society, Vol. 341, Issue 2 https://doi.org/10.1046/j.1365-8711.2003.06451.x	journal	May 2003
A survey for pulsating subdwarf B stars with the Nordic Optical Telescope Østensen, R. H.; Oreiro, R.; Solheim, J. -E. Astronomy and Astrophysics, Vol. 513 https://doi.org/10.1051/0004-6361/200913480	journal	April 2010
Hot subdwarf stars in close-up view Geier, S.; Heber, U.; Podsiadlowski, Ph. Astronomy and Astrophysics, Vol. 519 https://doi.org/10.1051/0004-6361/201014465	journal	September 2010
Massive unseen companions to hot faint underluminous stars from SDSS (MUCHFUSS) Geier, S.; Maxted, P. F. L.; Napiwotzki, R. Astronomy & Astrophysics, Vol. 526 https://doi.org/10.1051/0004-6361/201015794	journal	December 2010
Sirius A: turbulence or mass loss? Michaud, G.; Richer, J.; Vick, M. Astronomy & Astrophysics, Vol. 534 https://doi.org/10.1051/0004-6361/201116999	journal	September 2011
Hot subdwarf stars in close-up view Geier, S.; Heber, U. Astronomy & Astrophysics, Vol. 543 https://doi.org/10.1051/0004-6361/201219463	journal	July 2012
Hot subdwarf stars in close-up view Geier, S. Astronomy & Astrophysics, Vol. 549 https://doi.org/10.1051/0004-6361/201220549	journal	January 2013
The subdwarf B star SB 290 – A fast rotator on the extreme horizontal branch Geier, S.; Heber, U.; Heuser, C. Astronomy & Astrophysics, Vol. 551 https://doi.org/10.1051/0004-6361/201220964	journal	February 2013
A progenitor binary and an ejected mass donor remnant of faint type Ia supernovae Geier, S.; Marsh, T. R.; Wang, B. Astronomy & Astrophysics, Vol. 554 https://doi.org/10.1051/0004-6361/201321395	journal	June 2013
New evolutionary sequences for extremely low-mass white dwarfs Althaus, Leandro G.; Miller Bertolami, Marcelo M.; Córsico, Alejandro H. Astronomy & Astrophysics, Vol. 557 https://doi.org/10.1051/0004-6361/201321868	journal	August 2013
Hot subdwarf stars in close-up view Geier, S.; Heber, U.; Edelmann, H. Astronomy & Astrophysics, Vol. 557 https://doi.org/10.1051/0004-6361/201322057	journal	September 2013
Orbital solutions of eight close sdB binaries and constraints on the nature of the unseen companions Geier, S.; Østensen, R. H.; Heber, U. Astronomy & Astrophysics, Vol. 562 https://doi.org/10.1051/0004-6361/201323115	journal	February 2014
The blue-edge problem of the V1093 Herculis instability strip revisited using evolutionary models with atomic diffusion Bloemen, S.; Hu, H.; Aerts, C. Astronomy & Astrophysics, Vol. 569 https://doi.org/10.1051/0004-6361/201323309	journal	September 2014
On helium-dominated stellar evolution: the mysterious role of the O(He)-type stars Reindl, N.; Rauch, T.; Werner, K. Astronomy & Astrophysics, Vol. 566 https://doi.org/10.1051/0004-6361/201423498	journal	June 2014
Hot subdwarf binaries from the MUCHFUSS project: Analysis of 12 new systems and a study of the short-period binary population⋆ Kupfer, T.; Geier, S.; Heber, U. Astronomy & Astrophysics, Vol. 576 https://doi.org/10.1051/0004-6361/201425213	journal	March 2015
A new HW Vir binary from the Palomar Transient Factory Schindewolf, M.; Levitan, D.; Heber, U. Astronomy & Astrophysics, Vol. 580 https://doi.org/10.1051/0004-6361/201425581	journal	August 2015
The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project Geier, S.; Kupfer, T.; Heber, U. Astronomy & Astrophysics, Vol. 577 https://doi.org/10.1051/0004-6361/201525666	journal	April 2015
The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project (Corrigendum) Geier, S.; Kupfer, T.; Heber, U. Astronomy & Astrophysics, Vol. 602 https://doi.org/10.1051/0004-6361/201525666e	journal	June 2017
Quantitative spectral analysis of the sdB star HD 188112: A helium-core white dwarf progenitor Latour, M.; Heber, U.; Irrgang, A. Astronomy & Astrophysics, Vol. 585 https://doi.org/10.1051/0004-6361/201527445	journal	January 2016
Radial velocity variable, hot post-AGB stars from the MUCHFUSS project Reindl, N.; Geier, S.; Kupfer, T. Astronomy & Astrophysics, Vol. 587 https://doi.org/10.1051/0004-6361/201527637	journal	February 2016
Stellar wind models of subluminous hot stars Krtička, J.; Kubát, J.; Krtičková, I. Astronomy & Astrophysics, Vol. 593 https://doi.org/10.1051/0004-6361/201628433	journal	September 2016
Models of low-mass helium white dwarfs including gravitational settling, thermal and chemical diffusion, and rotational mixing Istrate, A. G.; Marchant, P.; Tauris, T. M. Astronomy & Astrophysics, Vol. 595 https://doi.org/10.1051/0004-6361/201628874	journal	October 2016
Subdwarf B stars from the common envelope ejection channel Xiong, H.; Chen, X.; Podsiadlowski, Ph. Astronomy & Astrophysics, Vol. 599 https://doi.org/10.1051/0004-6361/201629622	journal	February 2017
The ESO supernovae type Ia progenitor survey (SPY) Napiwotzki, R.; Karl, C. A.; Lisker, T. Astronomy & Astrophysics, Vol. 638 https://doi.org/10.1051/0004-6361/201629648	journal	June 2020
The MUCHFUSS photometric campaign Schaffenroth, V.; Geier, S.; Heber, U. Astronomy & Astrophysics, Vol. 614 https://doi.org/10.1051/0004-6361/201629789	journal	June 2018
A quantitative NLTE analysis of visual and ultraviolet spectra of four helium-rich subdwarf O stars Schindewolf, M.; Németh, P.; Heber, U. Astronomy & Astrophysics, Vol. 620 https://doi.org/10.1051/0004-6361/201732140	journal	November 2018
Spectral models for binary products: Unifying subdwarfs and Wolf-Rayet stars as a sequence of stripped-envelope stars Götberg, Y.; de Mink, S. E.; Groh, J. H. Astronomy & Astrophysics, Vol. 615 https://doi.org/10.1051/0004-6361/201732274	journal	July 2018
Formation of hot subdwarf B stars with neutron star components Wu, You; Chen, Xuefei; Li, Zhenwei Astronomy & Astrophysics, Vol. 618 https://doi.org/10.1051/0004-6361/201832686	journal	October 2018
Shotglas Latour, Marilyn; Randall, Suzanna K.; Calamida, Annalisa Astronomy & Astrophysics, Vol. 618 https://doi.org/10.1051/0004-6361/201833129	journal	October 2018
NLTE spectroscopic analysis of the³He anomaly in subluminous B-type stars Schneider, D.; Irrgang, A.; Heber, U. Astronomy & Astrophysics, Vol. 618 https://doi.org/10.1051/0004-6361/201833182	journal	October 2018
A quantitative spectral analysis of 14 hypervelocity stars from the MMT survey Irrgang, A.; Kreuzer, S.; Heber, U. Astronomy & Astrophysics, Vol. 615 https://doi.org/10.1051/0004-6361/201833315	journal	July 2018
Heavy metals in intermediate He-rich hot subdwarfs: the chemical composition of HZ 44 and HD 127493 Dorsch, M.; Latour, M.; Heber, U. Astronomy & Astrophysics, Vol. 630 https://doi.org/10.1051/0004-6361/201935724	journal	October 2019
The EREBOS project: Investigating the effect of substellar and low-mass stellar companions on late stellar evolution Schaffenroth, V.; Barlow, B. N.; Geier, S. Astronomy & Astrophysics, Vol. 630 https://doi.org/10.1051/0004-6361/201936019	journal	September 2019
Observed binary populations reflect the Galactic history Vos, J.; Bobrick, A.; Vučković, M. Astronomy & Astrophysics, Vol. 641 https://doi.org/10.1051/0004-6361/201937195	journal	September 2020
The population of hot subdwarf stars studied withGaia Geier, S. Astronomy & Astrophysics, Vol. 635 https://doi.org/10.1051/0004-6361/202037526	journal	March 2020
An in-depth reanalysis of the alleged type Ia supernova progenitor Henize 2−428 Reindl, N.; Schaffenroth, V.; Miller Bertolami, M. M. Astronomy & Astrophysics, Vol. 638 https://doi.org/10.1051/0004-6361/202038117	journal	June 2020
Alone but not lonely: Observational evidence that binary interaction is always required to form hot subdwarf stars Pelisoli, Ingrid; Vos, Joris; Geier, Stephan Astronomy & Astrophysics, Vol. 642 https://doi.org/10.1051/0004-6361/202038473	journal	October 2020
Formation of sdB-stars via common envelope ejection by substellar companions Kramer, M.; Schneider, F. R. N.; Ohlmann, S. T. Astronomy & Astrophysics, Vol. 642 https://doi.org/10.1051/0004-6361/202038702	journal	October 2020
Looking into the cradle of the grave: J22564–5910, a potential young post-merger hot subdwarf Vos, Joris; Pelisoli, Ingrid; Budaj, Jan Astronomy & Astrophysics, Vol. 655 https://doi.org/10.1051/0004-6361/202140391	journal	November 2021
EC 22536−5304: a lead-rich and metal-poor long-period binary Dorsch, M.; Jeffery, C. S.; Irrgang, A. Astronomy & Astrophysics, Vol. 653 https://doi.org/10.1051/0004-6361/202141381	journal	September 2021
The first heavy-metal hot subdwarf composite binary SB 744 Németh, P.; Vos, J.; Molina, F. Astronomy & Astrophysics, Vol. 653 https://doi.org/10.1051/0004-6361/202141442	journal	August 2021
Spectral analysis of sdB stars from the Hamburg Quasar Survey Edelmann, H.; Heber, U.; Hagen, H. -J. Astronomy & Astrophysics, Vol. 400, Issue 3 https://doi.org/10.1051/0004-6361:20030135	journal	March 2003
Discovery of a helium-core white dwarf progenitor Heber, U.; Edelmann, H.; Lisker, T. Astronomy & Astrophysics, Vol. 411, Issue 3 https://doi.org/10.1051/0004-6361:20031553	journal	November 2003
Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: I. Atmospheric parameters and cool companions of sdB stars Lisker, T.; Heber, U.; Napiwotzki, R. Astronomy & Astrophysics, Vol. 430, Issue 1 https://doi.org/10.1051/0004-6361:20040232	journal	January 2005
Abundance studies of sdB stars using UV echelle HST/STIS spectroscopy O'Toole, S. J.; Heber, U. Astronomy & Astrophysics, Vol. 452, Issue 2 https://doi.org/10.1051/0004-6361:20053948	journal	May 2006
Hot subdwarfs from the ESO supernova Ia progenitor survey Stroeer, A.; Heber, U.; Lisker, T. Astronomy & Astrophysics, Vol. 462, Issue 1 https://doi.org/10.1051/0004-6361:20065564	journal	November 2006
The hot subdwarf B + white dwarf binary KPD 1930+2752: A supernova type Ia progenitor candidate Geier, S.; Nesslinger, S.; Heber, U. Astronomy & Astrophysics, Vol. 464, Issue 1 https://doi.org/10.1051/0004-6361:20066098	journal	December 2006
Mass-loss and diffusion in subdwarf B stars and hot white dwarfs: do weak winds exist? Unglaub, K. Astronomy & Astrophysics, Vol. 486, Issue 3 https://doi.org/10.1051/0004-6361:20078019	journal	May 2008
Testing the forward modeling approach in asteroseismology: II. Structure and internal dynamics of the hot B subdwarf component in the close eclipsing binary system PG 1336-018 Charpinet, S.; Van Grootel, V.; Reese, D. Astronomy & Astrophysics, Vol. 489, Issue 1 https://doi.org/10.1051/0004-6361:200809907	journal	July 2008
Modeling He-rich subdwarfs through the hot-flasher scenario Miller Bertolami, M. M.; Althaus, L. G.; Unglaub, K. Astronomy & Astrophysics, Vol. 491, Issue 1 https://doi.org/10.1051/0004-6361:200810373	journal	September 2008
Double white dwarfs as progenitors of R Coronae Borealis stars and Type I supernovae Webbink, R. F. The Astrophysical Journal, Vol. 277 https://doi.org/10.1086/161701	journal	February 1984
Mass loss in globular cluster red giants - an evolutionary investigation Castellani, M.; Castellani, V. The Astrophysical Journal, Vol. 407 https://doi.org/10.1086/172547	journal	April 1993
Ultraviolet Radiation from Evolved Stellar Populations. I. Models Dorman, Ben; Rood, Robert T.; O'Connell, Robert W. The Astrophysical Journal, Vol. 419 https://doi.org/10.1086/173511	journal	December 1993
Atmospheric parameters of field subdwarf B stars Saffer, Rex A.; Bergeron, P.; Koester, D. The Astrophysical Journal, Vol. 432 https://doi.org/10.1086/174573	journal	September 1994
The Origin of Extreme Horizontal Branch Stars D'Cruz, Noella L.; Dorman, Ben; Rood, Robert T. The Astrophysical Journal, Vol. 466 https://doi.org/10.1086/177515	journal	July 1996
Can Planets Influence the Horizontal Branch Morphology? Soker, Noam The Astronomical Journal, Vol. 116, Issue 3 https://doi.org/10.1086/300503	journal	September 1998
Effects of Helium Mixing on the Evolution of Globular Cluster Stars Sweigart, Allen V. The Astrophysical Journal, Vol. 474, Issue 1 https://doi.org/10.1086/310414	journal	January 1997
Flash Mixing on the White Dwarf Cooling Curve: Understanding Hot Horizontal Branch Anomalies in NGC 2808 Brown, Thomas M.; Sweigart, Allen V.; Lanz, Thierry The Astrophysical Journal, Vol. 562, Issue 1 https://doi.org/10.1086/323862	journal	November 2001
Sloan Digital Sky Survey: Early Data Release Stoughton, Chris; Lupton, Robert H.; Bernardi, Mariangela The Astronomical Journal, Vol. 123, Issue 1 https://doi.org/10.1086/324741	journal	January 2002
First Full Evolutionary Computation of the Helium Flash-induced Mixing in Population II Stars Cassisi, Santi; Schlattl, Helmut; Salaris, Maurizio The Astrophysical Journal, Vol. 582, Issue 1 https://doi.org/10.1086/346200	journal	November 2002
Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope Wide Field Planetary Camera 2 Burgasser, Adam J.; Kirkpatrick, J. Davy; Reid, I. Neill The Astrophysical Journal, Vol. 586, Issue 1 https://doi.org/10.1086/346263	journal	March 2003
A Grid of Non‐LTE Line‐blanketed Model Atmospheres of O‐Type Stars Lanz, Thierry; Hubeny, Ivan The Astrophysical Journal Supplement Series, Vol. 146, Issue 2 https://doi.org/10.1086/374373	journal	June 2003
Single and Composite Hot Subdwarf Stars in the Light of 2MASS Photometry Stark, M. A.; Wade, Richard A. The Astronomical Journal, Vol. 126, Issue 3 https://doi.org/10.1086/377017	journal	September 2003
Flash Mixing on the White Dwarf Cooling Curve:Far Ultraviolet Spectroscopic ExplorerObservations of Three He‐rich sdB Stars Lanz, Thierry; Brown, Thomas M.; Sweigart, Allen V. The Astrophysical Journal, Vol. 602, Issue 1 https://doi.org/10.1086/380904	journal	February 2004
Common-Envelope Mergers: A Possible Channel for Forming Single sdB Stars Politano, Michael; Taam, Ronald E.; van der Sluys, Marc The Astrophysical Journal, Vol. 687, Issue 2 https://doi.org/10.1086/593328	journal	October 2008
SEGUE: A SPECTROSCOPIC SURVEY OF 240,000 STARS WITH g = 14-20 Yanny, Brian; Rockosi, Constance; Newberg, Heidi Jo The Astronomical Journal, Vol. 137, Issue 5 https://doi.org/10.1088/0004-6256/137/5/4377	journal	April 2009
Spectral Classification and Redshift Measurement for the Sdss-Iii Baryon Oscillation Spectroscopic Survey Bolton, Adam S.; Schlegel, David J.; Aubourg, Éric The Astronomical Journal, Vol. 144, Issue 5 https://doi.org/10.1088/0004-6256/144/5/144	journal	October 2012
IMPROVED DETERMINATION OF THE ATMOSPHERIC PARAMETERS OF THE PULSATING sdB STAR FEIGE 48 Latour, M.; Fontaine, G.; Green, E. M. The Astrophysical Journal, Vol. 788, Issue 1 https://doi.org/10.1088/0004-637X/788/1/65	journal	May 2014
The Eleventh and Twelfth data Releases of the Sloan Digital sky Survey: Final data from Sdss-Iii Alam, Shadab; Albareti, Franco D.; Prieto, Carlos Allende The Astrophysical Journal Supplement Series, Vol. 219, Issue 1 https://doi.org/10.1088/0067-0049/219/1/12	journal	July 2015
Hot Subluminous Stars Heber, U. Publications of the Astronomical Society of the Pacific, Vol. 128, Issue 966 https://doi.org/10.1088/1538-3873/128/966/082001	journal	July 2016
Validation of LAMOST stellar parameters with the PASTEL catalog Gao, Hua; Zhang, Hua-Wei; Xiang, Mao-Sheng Research in Astronomy and Astrophysics, Vol. 15, Issue 12 https://doi.org/10.1088/1674-4527/15/12/008	journal	December 2015
Testing common classical LTE and NLTE model atmosphere and line-formation codes for quantitative spectroscopy of early-type stars Przybilla, Norbert; Nieva, Maria-Fernanda; Butler, Keith Journal of Physics: Conference Series, Vol. 328 https://doi.org/10.1088/1742-6596/328/1/012015	journal	December 2011
The Fast-Rotating, Low-Gravity Subdwarf b star ec 22081–1916: Remnant of a Common Envelope Merger Event Geier, S.; Classen, L.; Heber, U. The Astrophysical Journal, Vol. 733, Issue 1 https://doi.org/10.1088/2041-8205/733/1/L13	journal	May 2011
HOW TO MAKE A SINGLETON sdB STAR VIA ACCELERATED STELLAR EVOLUTION Clausen, Drew; Wade, Richard A. The Astrophysical Journal, Vol. 733, Issue 2 https://doi.org/10.1088/2041-8205/733/2/L42	journal	May 2011
NLTE spectral analysis of the intermediate helium-rich subdwarf B star CPD−20°1123 Löbling, L. Monthly Notices of the Royal Astronomical Society, Vol. 497, Issue 1 https://doi.org/10.1093/mnras/staa1686	journal	June 2020
Confirming new white dwarf-ultracool dwarf binary candidates Hogg, M. A.; Casewell, S. L.; Wynn, G. A. Monthly Notices of the Royal Astronomical Society, Vol. 498, Issue 1 https://doi.org/10.1093/mnras/staa2233	journal	August 2020
A quantitative in-depth analysis of the prototype sdB+BD system SDSS J08205+0008 revisited in the Gaia era Schaffenroth, V.; Casewell, S. L.; Schneider, D. Monthly Notices of the Royal Astronomical Society, Vol. 501, Issue 3 https://doi.org/10.1093/mnras/staa3661	journal	November 2020
Discovery of extremely lead-rich subdwarfs: does heavy metal signal the formation of subdwarf B stars? N., Naslim; Jeffery, C. S.; Hibbert, A. Monthly Notices of the Royal Astronomical Society, Vol. 434, Issue 3 https://doi.org/10.1093/mnras/stt1091	journal	July 2013
The orbital periods of subdwarf B binaries produced by the first stable Roche Lobe overflow channel Chen, Xuefei; Han, Zhanwen; Deca, Jan Monthly Notices of the Royal Astronomical Society, Vol. 434, Issue 1 https://doi.org/10.1093/mnras/stt992	journal	June 2013
Spectroscopic orbital elements for the helium-rich subdwarf binary PG 1544+488 Şener, H. T.; Jeffery, C. S. Monthly Notices of the Royal Astronomical Society, Vol. 440, Issue 3 https://doi.org/10.1093/mnras/stu397	journal	April 2014
New binaries among UV-selected, hot subdwarf stars and population properties★ Kawka, A.; Vennes, S.; O'Toole, S. Monthly Notices of the Royal Astronomical Society, Vol. 450, Issue 4 https://doi.org/10.1093/mnras/stv821	journal	May 2015
Hydrogen in hot subdwarfs formed by double helium white dwarf mergers Hall, Philip D.; Jeffery, C. Simon Monthly Notices of the Royal Astronomical Society, Vol. 463, Issue 3 https://doi.org/10.1093/mnras/stw2188	journal	September 2016
The effects of diffusion in hot subdwarf progenitors from the common envelope channel Byrne, Conor M.; Jeffery, C. Simon; Tout, Christopher A. Monthly Notices of the Royal Astronomical Society, Vol. 475, Issue 4 https://doi.org/10.1093/mnras/sty158	journal	January 2018
The orbital period–mass ratio relation of wide sdB+MS binaries and its application to the stability of RLOF Vos, Joris; Vučković, Maja; Chen, Xuefei Monthly Notices of the Royal Astronomical Society, Vol. 482, Issue 4 https://doi.org/10.1093/mnras/sty3017	journal	November 2018
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14 Kepler, S. O.; Pelisoli, Ingrid; Koester, Detlev Monthly Notices of the Royal Astronomical Society https://doi.org/10.1093/mnras/stz960	journal	April 2019
Discovery of hot subdwarfs covered with helium-burning ash Werner, Klaus; Reindl, Nicole; Geier, Stephan Monthly Notices of the Royal Astronomical Society: Letters, Vol. 511, Issue 1 https://doi.org/10.1093/mnrasl/slac005	journal	February 2022
The binary fraction of extreme horizontal branch stars Maxted, P_f. L.; Heber, U.; Marsh, T. R. Monthly Notices of the Royal Astronomical Society, Vol. 326, Issue 4 https://doi.org/10.1111/j.1365-2966.2001.04714.x	journal	October 2001
On the formation of single and binary helium-rich subdwarf O stars Justham, Stephen; Podsiadlowski, Philipp; Han, Zhanwen Monthly Notices of the Royal Astronomical Society, Vol. 410, Issue 2 https://doi.org/10.1111/j.1365-2966.2010.17497.x	journal	September 2010
Radial-velocity measurements of subdwarf B stars Copperwheat, C. M.; Morales-Rueda, L.; Marsh, T. R. Monthly Notices of the Royal Astronomical Society, Vol. 415, Issue 2 https://doi.org/10.1111/j.1365-2966.2011.18786.x	journal	June 2011
Slowing down atomic diffusion in subdwarf B stars: mass loss or turbulence? Hu, Haili; Tout, C. A.; Glebbeek, E. Monthly Notices of the Royal Astronomical Society, Vol. 418, Issue 1 https://doi.org/10.1111/j.1365-2966.2011.19482.x	journal	September 2011
Evolutionary models for double helium white dwarf mergers and the formation of helium-rich hot subdwarfs Zhang, Xianfei; Jeffery, C. Simon Monthly Notices of the Royal Astronomical Society, Vol. 419, Issue 1 https://doi.org/10.1111/j.1365-2966.2011.19711.x	journal	October 2011
The helium-rich subdwarf CPD−20°1123: a post-common-envelope binary evolving on to the extended horizontal branch N., Naslim; Geier, S.; Jeffery, C. S. Monthly Notices of the Royal Astronomical Society, Vol. 423, Issue 4 https://doi.org/10.1111/j.1365-2966.2012.21012.x	journal	June 2012
Orbital properties of an unusually low-mass sdB star in a close binary system with a white dwarf Silvotti, R.; Østensen, R. H.; Bloemen, S. Monthly Notices of the Royal Astronomical Society, Vol. 424, Issue 3 https://doi.org/10.1111/j.1365-2966.2012.21232.x	journal	July 2012
A selection of hot subluminous stars in theGALEXsurvey – II. Subdwarf atmospheric parameters Németh, Péter; Kawka, Adéla; Vennes, Stéphane Monthly Notices of the Royal Astronomical Society, Vol. 427, Issue 3 https://doi.org/10.1111/j.1365-2966.2012.22009.x	journal	November 2012
2M1938+4603: a rich, multimode pulsating sdB star with an eclipsing dM companion observed with Kepler Østensen, R. H.; Green, E. M.; Bloemen, S. Monthly Notices of the Royal Astronomical Society: Letters, Vol. 408, Issue 1 https://doi.org/10.1111/j.1745-3933.2010.00926.x	journal	August 2010
The fastest unbound star in our Galaxy ejected by a thermonuclear supernova Geier, S.; Furst, F.; Ziegerer, E. Science, Vol. 347, Issue 6226 https://doi.org/10.1126/science.1259063	journal	March 2015
Hot Subdwarf Stars Heber, Ulrich Annual Review of Astronomy and Astrophysics, Vol. 47, Issue 1 https://doi.org/10.1146/annurev-astro-082708-101836	journal	September 2009
Meet the family − the catalog of known hot subdwarf stars Geier, Stephan; Østensen, Roy H.; Nemeth, Peter Open Astronomy, Vol. 26, Issue 1 https://doi.org/10.1515/astro-2017-0432	journal	December 2017
A FEROS Survey of Hot Subdwarf Stars Vennes, Stéphane; Németh, Péter; Kawka, Adela Open Astronomy, Vol. 27, Issue 1 https://doi.org/10.1515/astro-2018-0005	journal	February 2018
Spectral energy distributions and colours of hot subluminous stars Heber, Ulrich; Irrgang, Andreas; Schaffenroth, Johannes Open Astronomy, Vol. 27, Issue 1 https://doi.org/10.1515/astro-2018-0008	journal	February 2018
Hot Subdwarf Stars Observed in Lamost Dr1—Atmospheric Parameters from Single-Lined Spectra Luo, Yang-Ping; Németh, Péter; Liu, Chao The Astrophysical Journal, Vol. 818, Issue 2 https://doi.org/10.3847/0004-637X/818/2/202	journal	February 2016
BINARY CENTRAL STARS OF PLANETARY NEBULAE DISCOVERED THROUGH PHOTOMETRIC VARIABILITY. V. THE CENTRAL STARS OF HaTr 7 AND ESO 330-9 Hillwig, Todd C.; Frew, David J.; Reindl, Nicole The Astronomical Journal, Vol. 153, Issue 1 https://doi.org/10.3847/1538-3881/153/1/24	journal	December 2016
PTF1 J082340.04+081936.5: A Hot Subdwarf B Star with a Low-mass White Dwarf Companion in an 87-minute Orbit Kupfer, Thomas; Roestel, Jan van; Brooks, Jared The Astrophysical Journal, Vol. 835, Issue 2 https://doi.org/10.3847/1538-4357/835/2/131	journal	January 2017
The OmegaWhite Survey for Short-period Variable Stars. V. Discovery of an Ultracompact Hot Subdwarf Binary with a Compact Companion in a 44-minute Orbit Kupfer, T.; Ramsay, G.; Roestel, J. van The Astrophysical Journal, Vol. 851, Issue 1 https://doi.org/10.3847/1538-4357/aa9522	journal	December 2017
New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra Lei, Zhenxin; Zhao, Jingkun; Németh, Péter The Astrophysical Journal, Vol. 868, Issue 1 https://doi.org/10.3847/1538-4357/aae82b	journal	November 2018
Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR5 Luo, Yangping; Németh, Péter; Deng, Licai The Astrophysical Journal, Vol. 881, Issue 1 https://doi.org/10.3847/1538-4357/ab298d	journal	August 2019
New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra. II. Lei, Zhenxin; Zhao, Jingkun; Németh, Péter The Astrophysical Journal, Vol. 881, Issue 2 https://doi.org/10.3847/1538-4357/ab2edc	journal	August 2019
EVR-CB-001: An Evolving, Progenitor, White Dwarf Compact Binary Discovered with the Evryscope Ratzloff, Jeffrey K.; Barlow, Brad N.; Kupfer, Thomas The Astrophysical Journal, Vol. 883, Issue 1 https://doi.org/10.3847/1538-4357/ab3727	journal	September 2019
A Neutral Beam Model for High-energy Neutrino Emission from the Blazar TXS 0506+056 Zhang, B. Theodore; Petropoulou, Maria; Murase, Kohta The Astrophysical Journal, Vol. 889, Issue 2 https://doi.org/10.3847/1538-4357/ab659a	journal	January 2020
The First Ultracompact Roche Lobe–Filling Hot Subdwarf Binary Kupfer, Thomas; Bauer, Evan B.; Marsh, Thomas R. The Astrophysical Journal, Vol. 891, Issue 1 https://doi.org/10.3847/1538-4357/ab72ff	journal	March 2020
Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II.Kinematics Luo, Yangping; Németh, Péter; Li, Qida The Astrophysical Journal, Vol. 898, Issue 1 https://doi.org/10.3847/1538-4357/ab98f3	journal	July 2020
EVR-CB-004: An Inflated Hot Subdwarf O Star + Unseen WD Companion in a Compact Binary Discovered with the Evryscope Ratzloff, Jeffrey K.; Kupfer, Thomas; Barlow, Brad N. The Astrophysical Journal, Vol. 902, Issue 2 https://doi.org/10.3847/1538-4357/abb5b2	journal	October 2020
Hot Subdwarf Atmospheric Parameters, Kinematics, and Origins Based on 1587 Hot Subdwarf Stars Observed in Gaia DR2 and LAMOST DR7 Luo, Yangping; Németh, Péter; Wang, Kun The Astrophysical Journal Supplement Series, Vol. 256, Issue 2 https://doi.org/10.3847/1538-4365/ac11f6	journal	September 2021
Discovery of a Double-detonation Thermonuclear Supernova Progenitor Kupfer, Thomas; Bauer, Evan B.; van Roestel, Jan The Astrophysical Journal Letters, Vol. 925, Issue 2 https://doi.org/10.3847/2041-8213/ac48f1	journal	January 2022

Similar Records

A helium-carbon correlation on the extreme horizontal branch in ω Centauri

Journal Article · Sun Nov 09 23:00:00 EST 2014 · Astrophysical Journal · OSTI ID:22370259

Spectroscopic survey of faint planetary-nebula nuclei – II. The subdwarf O central star of Fr 2-30

Journal Article · Wed May 31 20:00:00 EDT 2023 · Monthly Notices of the Royal Astronomical Society · OSTI ID:1984910

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
binaries
horizontal-branch
spectroscopic
stars
subdwarfs

Radial velocity variability and the evolution of hot subdwarf stars

Citation Formats

References (120)

Linked Research (1)

Similar Records

Related Subjects