Radial velocities and binarity of southern SIM grid stars
arXiv:1410.7943 · doi:10.1093/mnras/stu2239
Abstract
We present analysis of precision radial velocities (RV) of 1134 mostly red giant stars in the southern sky, selected as candidate astrometric grid objects for the Space Interferometry Mission (SIM). Only a few (typically, 2 or 3) spectroscopic observations per star have been collected, with the main goal of screening binary systems. The estimated rate of spectroscopic binarity in this sample of red giants is 32% at the 0.95 confidence level, and 46% at the 0.75 confidence. The true binarity rate is likely to be higher, because our method is not quite sensitive to very wide binaries and low-mass companions. The estimated lower and upper bounds of stellar RV jitter for the entire sample are 24 and 51 m/s, respectively; the adopted mean value is 37 m/s. A few objects of interest are identified with large variations of radial velocities, implying abnormally high mass ratios.
arXiv commentAccepted in MNRAS. The full table with data is available online
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Cited by in corpus (8)
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- Gaia Data Release 2: Properties and validation of the radial velocities
- Gaia Data Release 3: Catalogue Validation
- Gaia Data Release 2: Processing the spectroscopic data
- Observations of red giants with suspected massive companions
- Two-epoch orbit estimation for wide binaries resolved in Hipparcos and Gaia