Trigonometric Parallaxes to TW Hydrae Association Stars: Analysis and Implications

Details Trigonometric Parallaxes to TW Hydrae Association Stars: Analysis and Implications Trigonometric Parallaxes to TW Hydrae Association Stars: Analysis and Implications

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734012w&link_type=abstract

American Astronomical Society, AAS Meeting #217, #340.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Trigonometric parallaxes to claimed members of the TW Hydrae Association were measured using CAPSCam on the duPont Telescope at Las Campanas Observatory. The distances to the fourteen stellar systems, including two pairs of close visual binaries in which the stars are measured independently, complement the six existing parallaxes in the literature. The stars extend from 45 to 110 pc. A moving cluster analysis, in which the three-dimensional velocities of all the stars were propagated back in time from their present location, indicates that there was a time of convergence and shows that the two most distant stars (TWA 14 and 15) are likely not members of TWA. Some particular objects of note are highlighted. 2M1235-39, a proper motion companion to HR 4796, is confirmed to be at the same distance as HR 4796A. The parallactic distance to the TWA 5Aa binary, whose astrometric orbit was measured by Konopacky et al. (2007), is 56 ± 2 pc. This implies a dynamical mass of the two nearly identical M1.5-type stars of 1.4 M&sun;, a factor of two higher than inferred using the Mamajek (2005) convergent-point distance to the system. In addition, good seeing images in 2008, 2009 and 2010 show the brown dwarf companion to TWA 5A.

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