Studies of early-type binaries: TU Mus and MP Cen

Details Studies of early-type binaries: TU Mus and MP Cen Studies of early-type binaries: TU Mus and MP Cen

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..318..215t&link_type=abstract

In Spectroscopically and Spatially Resolving the Components of the Close Binary Stars, Proceedings of the Workshop held 20-24 Oc

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We have begun a project to gather modern data on early-type overcontact and near-contact binaries, systems about which very little is known. The overcontact systems consist of O, B and A-type stars that are in physical contact with one another, similar to their late-type cousins the W UMa systems. We are obtaining high resolution (R≈ 50,000) spectra to analyze simultaneously with high precision photometry. Our goal is to have the most accurate parameters possible for a variety of early-type systems that are in various stages of their evolution for comparison to 3D structural models that are in development. Here we present results on TU Muscae, an O-type overcontact system and MP Centauri, a B-type semidetached system. We have derived accurate masses and radii for the systems and show that TU Mus has had a constant orbital period over the thirty years of observations that we analyzed. This result for TU Mus may imply that the mass transfer seen in the W UMa systems does not occur in the early-type overcontact systems.

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