Proper motion and X-ray selected search for new members of the young TW Hya association

Details Proper motion and X-ray selected search for new members of the young TW Hya association Proper motion and X-ray selected search for new members of the young TW Hya association

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003an....324..543t&link_type=abstract

Astronomische Nachrichten, Vol. 324, Issue 6, p. 543-551

Astronomy and Astrophysics

Astronomy

4

Open Clusters And Associations: Individual (Tw Hya), Stars: Late-Type, Stars: Pre-Main Sequence, X-Rays: Stars

Scientific paper

We have searched for new members of the TW Hya association (TWA) among unidentified ROSAT X-ray sources by identifying them in proper motion catalogues and selecting those that would be consistent with kinematical membership to the TWA. Spectroscopic follow-up observations of 19 member candidates revealed the detection of moderate lithium absorption lines for the following three stars: GSC 7206 845, TYC 7216-55, and TYC 7247-12. The isochronal ages of the latter TYC stars are estimated to be ˜ 20 Myr while the other one has ˜ 100 Myr age based on a kinematic distance estimate that assumes TWA membership. However, the moderately Li-rich stars are not likely to be new pre-main sequence members of TWA partly because of the discrepant radial velocities. Infrared follow-up imaging in the H-band for the 3 stars shows companion candidates near two of them. While one system (TYC 7216-55) is probably a near-equal-magnitude stellar binary, our follow-up H-band spectrum of the faint companion candidate near GSC 7206 845 shows that it is instead a background K-type star rather than a companion.
Based on observations obtained in ESO programs 66.C-0540, 66.C-0138B, and 68.C-0009 on La Silla, Chile, as well as with ROSAT and the University of Hawaii Institute for Astronomy 2.2m telescope on Mauna Kea.

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