The Detection of Low Mass Secondaries in Hyades Cluster Spectroscopic Binary Stars

Details The Detection of Low Mass Secondaries in Hyades Cluster Spectroscopic Binary Stars The Detection of Low Mass Secondaries in Hyades Cluster Spectroscopic Binary Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0327b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #03.27; Bulletin of the American Astronomical Society, Vol. 39, p.727

Astronomy and Astrophysics

Astronomy

Scientific paper

We have carried out a survey of spectroscopic binary stars in the Hyades Cluster to determine dynamical mass ratios and measure orbital parameters. Here, we present double-lined solutions for 25 binaries that result from the application of infrared spectroscopy to systems previously identified as single-lined binaries by visible light spectroscopy. When combined with the single-lined solutions, the infrared observations yield the full double-lined spectroscopic orbit and the dynamical mass ratio for each system. We merge these results with binaries with mass ratios close to one that were observed as double-lined systems in the visible, and with wide binaries from the speckle imaging survey of Patience and colleagues. From the aggregate sample of approximately 70 binaries we derive a preliminary dynamical mass ratio distribution for the Hyades cluster that is quantitatively different from distributions that have been derived for binaries in the solar neighborhood. Astrometric parameters for the Hyades spectroscopic binaries, particularly the inclinations, are not available, but our results enable us to estimate the secondary masses from photometry.
CB is supported by an NRC Research Associateship Award at NRL; basic research in infrared astronomy at NRL is supported by 6.1 base funding.

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