Galactic population of black holes in detached binaries with low-mass stripped helium stars: the case of LB-1 (LS~V+22~25)

Abstract

We model the Galactic population of detached binaries that harbor black holes with (0.5-1.7) solar mass companions -- the remnants of case B mass-exchange that rapidly cross Hertzsprung gap after the termination of the Roche-lobe overflow or as He-shell burning stars. Several such binaries can be currently present in the Galaxy. The range of black hole masses in them is about 4 to 10 solar ones, the orbital periods are tens to hundreds day. The unique BH-binary LB-1 fits well into this extremely rare class of double stars.

arXiv comment5 pp., 6 figures. Accepted for publication in Monthly Notices of the Royal Astronomical Society Letters

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• Non-interacting black hole binaries with Gaia and LAMOST
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• Stars stripped in binaries -- the living gravitational wave sources
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