التفاصيل البيبلوغرافية
| العنوان: |
Radial Velocities of Low-mass Candidate TWA Members. |
| المؤلفون: |
Benjamin Kidder, Gregory Mace, Kimberly Sokal, Ricardo Lopez, Daniel Jaffe |
| المصدر: |
Astrophysical Journal; 7/10/2019, Vol. 879 Issue 2, p1-1, 1p |
| مصطلحات موضوعية: |
RADIAL velocity of stars, STELLAR evolution, MEMBERSHIP in associations, institutions, etc., VELOCITY, VELOCITY measurements |
| مستخلص: |
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 FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
