THIRTY NEW LOW-MASS SPECTROSCOPIC BINARIES
Abstract
As part of our search for young M dwarfs within 25 pc, we acquired high-resolution spectra of 185 low-mass stars compiled by the NStars project that have strong X-ray emission. By cross-correlating these spectra with radial velocity standard stars, we are sensitive to finding multi-lined spectroscopic binaries. We find a low-mass spectroscopic binary fraction of 16% consisting of 27 SB2s, 2 SB3s, and 1 SB4, increasing the number of known low-mass spectroscopic binaries (SBs) by 50% and proving that strong X-ray emission is an extremely efficient way to find M-dwarf SBs. WASP photometry of 23 of these systems revealed two low-mass eclipsing binaries (EBs), bringing the count of known M-dwarf EBs to 15. BD-22 5866, the ESB4, was fully described in 2008 by Shkolnik et al. and CCDM J04404+3127 B consists of two mid-M stars orbiting each other every 2.048 days. WASP also provided rotation periods for 12 systems, and in the cases where the synchronization time scales are short, we used P{sub rot} to determine the true orbital parameters. For those with no P{sub rot}, we used differential radial velocities to set upper limits on orbital periods and semimajor axes. More than half of our sample has near-equal-mass componentsmore »
- Authors:
-
- Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015 (United States)
- School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, Fife KY16 9SS (United Kingdom)
- Institute for Astronomy, University of Hawaii at Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
- Publication Date:
- OSTI Identifier:
- 21452902
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 716; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/716/2/1522; Journal ID: ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EMISSION; MASS; PHOTOMETRY; RADIAL VELOCITY; STAR EVOLUTION; STARS; X RADIATION; ELECTROMAGNETIC RADIATION; EVOLUTION; IONIZING RADIATIONS; RADIATIONS; VELOCITY
Citation Formats
Shkolnik, Evgenya L, Hebb, Leslie, Cameron, Andrew C, Liu, Michael C, and Neill Reid, I., E-mail: shkolnik@dtm.ciw.ed, E-mail: Andrew.Cameron@st-and.ac.u, E-mail: leslie.hebb@vanderbilt.ed, E-mail: mliu@ifa.hawaii.ed, E-mail: inr@stsci.ed. THIRTY NEW LOW-MASS SPECTROSCOPIC BINARIES. United States: N. p., 2010.
Web. doi:10.1088/0004-637X/716/2/1522.
Shkolnik, Evgenya L, Hebb, Leslie, Cameron, Andrew C, Liu, Michael C, & Neill Reid, I., E-mail: shkolnik@dtm.ciw.ed, E-mail: Andrew.Cameron@st-and.ac.u, E-mail: leslie.hebb@vanderbilt.ed, E-mail: mliu@ifa.hawaii.ed, E-mail: inr@stsci.ed. THIRTY NEW LOW-MASS SPECTROSCOPIC BINARIES. United States. https://doi.org/10.1088/0004-637X/716/2/1522
Shkolnik, Evgenya L, Hebb, Leslie, Cameron, Andrew C, Liu, Michael C, and Neill Reid, I., E-mail: shkolnik@dtm.ciw.ed, E-mail: Andrew.Cameron@st-and.ac.u, E-mail: leslie.hebb@vanderbilt.ed, E-mail: mliu@ifa.hawaii.ed, E-mail: inr@stsci.ed. 2010.
"THIRTY NEW LOW-MASS SPECTROSCOPIC BINARIES". United States. https://doi.org/10.1088/0004-637X/716/2/1522.
@article{osti_21452902,
title = {THIRTY NEW LOW-MASS SPECTROSCOPIC BINARIES},
author = {Shkolnik, Evgenya L and Hebb, Leslie and Cameron, Andrew C and Liu, Michael C and Neill Reid, I., E-mail: shkolnik@dtm.ciw.ed, E-mail: Andrew.Cameron@st-and.ac.u, E-mail: leslie.hebb@vanderbilt.ed, E-mail: mliu@ifa.hawaii.ed, E-mail: inr@stsci.ed},
abstractNote = {As part of our search for young M dwarfs within 25 pc, we acquired high-resolution spectra of 185 low-mass stars compiled by the NStars project that have strong X-ray emission. By cross-correlating these spectra with radial velocity standard stars, we are sensitive to finding multi-lined spectroscopic binaries. We find a low-mass spectroscopic binary fraction of 16% consisting of 27 SB2s, 2 SB3s, and 1 SB4, increasing the number of known low-mass spectroscopic binaries (SBs) by 50% and proving that strong X-ray emission is an extremely efficient way to find M-dwarf SBs. WASP photometry of 23 of these systems revealed two low-mass eclipsing binaries (EBs), bringing the count of known M-dwarf EBs to 15. BD-22 5866, the ESB4, was fully described in 2008 by Shkolnik et al. and CCDM J04404+3127 B consists of two mid-M stars orbiting each other every 2.048 days. WASP also provided rotation periods for 12 systems, and in the cases where the synchronization time scales are short, we used P{sub rot} to determine the true orbital parameters. For those with no P{sub rot}, we used differential radial velocities to set upper limits on orbital periods and semimajor axes. More than half of our sample has near-equal-mass components (q > 0.8). This is expected since our sample is biased toward tight orbits where saturated X-ray emission is due to tidal spin-up rather than stellar youth. Increasing the samples of M-dwarf SBs and EBs is extremely valuable in setting constraints on current theories of stellar multiplicity and evolution scenarios for low-mass multiple systems.},
doi = {10.1088/0004-637X/716/2/1522},
url = {https://www.osti.gov/biblio/21452902},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 716,
place = {United States},
year = {Sun Jun 20 00:00:00 EDT 2010},
month = {Sun Jun 20 00:00:00 EDT 2010}
}