SPECTROSCOPIC BINARIES IN THE ORION NEBULA CLUSTER AND NGC 2264
ABSTRACT We examine the spectroscopic binary population for two massive nearby regions of clustered star formation, the Orion Nebula Cluster (ONC) and NGC 2264, supplementing the data presented by Tobin et al. with more recent observations and more extensive analysis. The inferred multiplicity fract...
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Published in | The Astrophysical journal Vol. 821; no. 1; p. 8 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
The American Astronomical Society
10.04.2016
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Subjects | |
Online Access | Get full text |
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Summary: | ABSTRACT We examine the spectroscopic binary population for two massive nearby regions of clustered star formation, the Orion Nebula Cluster (ONC) and NGC 2264, supplementing the data presented by Tobin et al. with more recent observations and more extensive analysis. The inferred multiplicity fraction up to 10 au based on these observations is 5.3 1.2% for NGC 2264 and 5.8 1.1% for the ONC; these values are consistent with the distribution of binaries in the field in the relevant parameter range. Eight of the multiple systems in the sample have enough epochs to perform an initial fit for the orbital parameters. Two of these sources are double-lined spectroscopic binaries; for them, we determine the mass ratio. Our reanalysis of the distribution of stellar radial velocities toward these clusters presents a significantly better agreement between stellar and gas kinematics than was previously thought. |
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Bibliography: | Stars ApJ101166 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0004-637X 1538-4357 |
DOI: | 10.3847/0004-637X/821/1/8 |