Radial Velocity Survey of Members and Candidate Members of the TW Hydrae Association

Authors

Guillermo Torres, Harvard-Smithsonian Center for AstrophysicsFollow
Eike W. Guenther
Laurence A. Marschall, Gettysburg CollegeFollow
Ralph NeuhauserFollow
David W. Latham, Harvard-Smithsonian Center for Astrophysics
Robert P. Stefanik, Harvard-Smithsonian Center for AstrophysicsFollow

Document Type

Article

Publication Date

2-2003

Department 1

Physics

Abstract

We report 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 three double-lined binaries, one singlelined 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 are 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.

Copyright Note

This is the publisher's version of the work. This publication appears in Gettysburg College's institutional repository by permission of the copyright owner for personal use, not for redistribution.

DOI

10.1086/345968

Recommended Citation

Torres, Guillermo, et al. Radial Velocity Survey of Members and Candidate Members of the TW Hydrae Association. The Astronomical Journal (February 2003) 125:825-841.

Required Publisher's Statement

Original version available from publisher at: http://iopscience.iop.org/1538-3881