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Title: SPECTROSCOPIC BINARIES IN THE ORION NEBULA CLUSTER AND NGC 2264

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.
Authors:
; ; ; ;  [1] ;  [2]
  1. Department of Astronomy, University of Michigan, 1085 S. University Street, Ann Arbor, MI 48109 (United States)
  2. Leiden Observatory, Leiden University, P.O. Box 9513, 2300-RA Leiden (Netherlands)
Publication Date:
OSTI Identifier:
22518520
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 821; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; MASS; MULTIPLICITY; NEBULAE; RADIAL VELOCITY; STAR CLUSTERS; STAR EVOLUTION