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Title: 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 » (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.« less

Authors:
 [1]; ;  [2];  [3]
  1. Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015 (United States)
  2. School of Physics and Astronomy, University of St. Andrews, North Haugh, St Andrews, Fife KY16 9SS (United Kingdom)
  3. 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}
}