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HD 107796


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Proper motion and X-ray selected search for new members of the young TW Hya association
We have searched for new members of the TW Hya association (TWA) amongunidentified ROSAT X-ray sources by identifying them in proper motioncatalogues and selecting those that would be consistent with kinematicalmembership to the TWA. Spectroscopic follow-up observations of 19 membercandidates revealed the detection of moderate lithium absorption linesfor the following three stars: GSC 7206 845, TYC 7216-55, and TYC7247-12. The isochronal ages of the latter TYC stars are estimated to be˜ 20 Myr while the other one has ˜ 100 Myr age based on akinematic distance estimate that assumes TWA membership. However, themoderately Li-rich stars are not likely to be new pre-main sequencemembers of TWA partly because of the discrepant radial velocities.Infrared follow-up imaging in the H-band for the 3 stars shows companioncandidates near two of them. While one system (TYC 7216-55) is probablya near-equal-magnitude stellar binary, our follow-up H-band spectrum ofthe faint companion candidate near GSC 7206 845 shows that it is insteada 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 theUniversity of Hawaii Institute for Astronomy 2.2m telescope on MaunaKea.

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Observation and Astrometry data

Constellation:Ύδρα
Right ascension:12h23m21.92s
Declination:-26°28'17.4"
Apparent magnitude:7.827
Distance:133.69 parsecs
Proper motion RA:-47.8
Proper motion Dec:-5.2
B-T magnitude:8.286
V-T magnitude:7.865

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 107796
TYCHO-2 2000TYC 6689-786-1
USNO-A2.0USNO-A2 0600-14858039
HIPHIP 60426

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