Stellar Masses For BE Ursae Majoris, A Binary Just Emerged From the Common Envelope Phase

Details Stellar Masses For BE Ursae Majoris, A Binary Just Emerged From the Common Envelope Phase Stellar Masses For BE Ursae Majoris, A Binary Just Emerged From the Common Envelope Phase

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30q.761f&link_type=abstract

American Astronomical Society Meeting, 191, #125.06

Astronomy and Astrophysics

Astronomy

Scientific paper

The masses of the detached eclipsing binary star BE Ursae Majoris are of great interest because the system has recently emerged from the common-envelope evolutionary phase. BE UMa consists of a T 100,000 K log g = 6.5 sdO/DAO primary and a K-type dwarf secondary located nearby. The spectrum of the hot primary dominates only at UV wavelengths because the reflection effect from the exposed hemisphere of the secondary dominates the energy distribution at visible wavelengths. We obtained HST/GHRS radial velocity measurements of both the primary and secondary stars at 1640 A and find the primary and secondary masses are approximately 0.5 and 0.3 times solar, respectively. We also modeled the eclipse curve and found the secondary star's radius is too large for a main sequence star. Evidently, it is still thermally relaxing. A comprehensive analysis is presented.

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