Low mass X-ray binaries with pre-main sequence companions

Details Low mass X-ray binaries with pre-main sequence companions Low mass X-ray binaries with pre-main sequence companions

2006-11-07

arxiv.org/abs/astro-ph/0611235v1

Astrophys.J.653:L137-L140,2006

Astronomy and Astrophysics

Astrophysics

4 pages in emuapj style, 3 fugures, to appear in ApJL

Scientific paper

10.1086/510672

In this Letter we examine the idea that a subset of short-period black-hole low-mass X-ray binaries could be powered by the mass transfer from pre-main sequence donors. As the star contracts towards the main sequence, the strong magnetic fields operate the magnetic braking which dissipates the orbital angular momentum, driving the binary to contact. We show that the periods and apparent donor spectral classes of the X-ray binaries with a pre-main sequence donor agree better with the available observations of black hole X-ray binaries than those of binaries with a main-sequence donor. This mechanism also explains, without the need for additional hypotheses, the roughly primordial abundance of Li detected in donor companions of black hole X-ray candidates in our Galaxy.

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