期刊
ASTROPHYSICAL JOURNAL
卷 879, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab2591
关键词
binaries: spectroscopic; stars: kinematics and dynamics; stars: late-type; stars: low-mass
资金
- U.S. National Science Foundation [AST-1229522, AST-1702267]
- University of Texas at Austin
- Korean GMT Project of KASI
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 Sigma 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.
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