The Evolutionary State of the Massive Interacting Binary BD+36 4063

Details The Evolutionary State of the Massive Interacting Binary BD+36 4063 The Evolutionary State of the Massive Interacting Binary BD+36 4063

2009-04-23

arxiv.org/abs/0904.3733v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

14 pages, 3 figures, accepted to ApJ Letters

Scientific paper

10.1088/0004-637X/696/2/L137

We present a spectroscopic and photometric analysis of the remarkable massive binary system, BD +36 4063. We argue that the visible ON star is undergoing a rapid mass transfer episode that results in a thick and opaque disk that surrounds and renders invisible its massive companion. A comparison of the projected rotational velocity and the orbital semiamplitude of the visible star indicates a mass ratio near unity. Models for conservative mass transfer show that the equal mass state occurs at the point of minimum separation, and we argue that BD +36 4063 may represent the first system identified at this rapid and rare stage of massive binary evolution.

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