Where Are Be/black-hole Binaries?

Details Where Are Be/black-hole Binaries? Where Are Be/black-hole Binaries?

2003-11-23

arxiv.org/abs/astro-ph/0311523v1

Astrophys.J. 603 (2004) 663-668

Astronomy and Astrophysics

Astrophysics

14 pages,3 figures, ApJ accepted

Scientific paper

10.1086/381540

We apply the tidal truncation model proposed by Negueruela & Okazaki(2001) to arbitrary Be/compact star binaries to study the truncation efficiency dependance on the binary parameters. We find that the viscous decretion disks around the Be stars could be truncated very effectively in narrow systems. Combining this with the population synthesis results of Podsiadlowski, Rappaport and Han (2003) that binary black holes are most likely to be born in systems with orbital periods less than about 30 days, we suggest that most of the Be/black-hole binaries may be transient systems with very long quiescent states. This could explain the lack of observed Be/black-hole X-ray binaries. We also discuss the evolution of the Be/black-hole binaries and their possible observational features.

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