2019ApJ...879...63K -
Astrophys. J., 879, 63-63 (2019/July-2)
Radial velocities of low-mass candidate TWA members.
KIDDER B., MACE G., SOKAL K., LOPEZ R. and JAFFE D.
Abstract (from CDS):
Nearby young moving groups provide unique samples of similar age stars for testing the evolution of physical properties. Incomplete and/or incorrect group membership classifications reduce the usefulness of the group, which we assume to be coeval. With near-infrared spectra of two candidate members of the TW Hya Association, 2MASS J12354615-4115531 (TWA 46) and 2MASS J12371238-4021480 (TWA 47), we test their membership by adding radial velocity measurements to the literature. We find that 2MASS J12354615-4115531 is a close spectroscopic binary system with a center-of-mass radial velocity of -6.5 ± 3.9 km s–1. This radial velocity and a Gaia parallax produces a TW Hydra association (TWA) membership probability of 41.9% using the Banyan Σ tool for 2MASS J12354615-4115531. The spectrum of 2MASS J12371238-4021480 shows that it appears to be a single star with a radial velocity consistent with the TW Hya Association and a membership probability of 99.5%. The reduced probability of TWA 46 as a true member of TWA highlights the importance of high-resolution, near-infrared spectra in validating low-mass moving group members.
Abstract Copyright:
© 2019. The American Astronomical Society. All rights reserved.
Journal keyword(s):
binaries: spectroscopic - stars: kinematics and dynamics - stars: late-type - stars: low-mass
Simbad objects:
11
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