Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-07
Astronomy and Astrophysics
Astrophysics
46 pages, including 5 figures and 17 tables; to appear in the February 2003 issue of The Astronomical Journal
Scientific paper
10.1086/345968
We report our spectroscopic observations of stars belonging to the young nearby group known as the TW Hydrae association, as well as of a number of potential members of the association identified in kinematic and X-ray surveys. Multiple radial velocity measurements were obtained for each object, several of which turn out to be multiple systems. Orbital solutions are presented for 3 double-lined binaries, one single-lined binary, and a double-lined triple system, all with short periods. Effective temperatures and projected rotational velocities are presented for each visible object. None of the candidate members of the association in our sample is confirmed as a true member. The large fraction of close binaries among the candidate members has to do with their selection based on X-ray emission from ROSAT, which tends to favor the inclusion of tidally-locked systems that are active but not necessarily young.
Guenther Eike W.
Latham David W.
Marschall Laurence A.
Neuhaeuser Ralph
Stefanik Robert P.
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