Mass Determinations of Population II Binary Stars

Details Mass Determinations of Population II Binary Stars Mass Determinations of Population II Binary Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21113101w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #131.01; Bulletin of the American Astronomical Society, Vol. 39, p.958

Astronomy and Astrophysics

Astronomy

Scientific paper

Accurate mass determinations of Population II stars are essential to understanding the metallicity effects in stellar evolutionary models of the old stars in the Galactic halo. This research contributes accurate mass estimates for the three dwarf Population II binary systems HD 157948, HD 195987, and HD 200580. Results were obtained via a simultaneous least-squares adjustment of double-line spectroscopic and astrometric data to find the best fit orbital parameters and masses with error estimates. Monte Carlo simulations of theoretical data sets were used to test the consistency and accuracy of the optimization techniques in order to gauge the reliability of results. These theoretical data were designed to match orbital parameters that likely describe the three binary systems of this study. The results of the Monte Carlo analysis imply that reported mass estimates and error bars are indeed reliable for each particular orbit and given set of observation times. These reported masses can, therefore, effectively contribute to a Population II Mass-Luminosity Relationship. This work was conducted during a Research Experience for Undergraduates (REU) at the University of Hawaii's Institute for Astronomy and funded by the NSF.

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