Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220p..13e&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 15, 1986, p. 13P-18P.
Astronomy and Astrophysics
Astronomy
45
Black Holes (Astronomy), Stellar Evolution, Triple Stars, X Ray Binaries, Dwarf Stars, Neutron Stars, Stellar Mass, Supergiant Stars
Scientific paper
To explain the presence of a relatively massive black hole in 2A0620-00 the authors propose a new evolutionary scenario for the formation of short-period, low-mass X-ray binaries. The progenitor in this scenario is a triple star in which a massive close binary is accompanied at large distance by a late dwarf. After the evolution of the close binary into an ordinary X-ray binary, the compact object is engulfed by its expanding massive companion, and spirals in to settle at its centre. The resulting Thorne-Zytkow supergiant gradually expands until it attains the size of the late-dwarf orbit. Then a second spiral-in phase ensues, leading to the formation of a low-mass close binary. Depending on the initial parameters of the massive binary, this close low-mass binary may contain either a black hole or a neutron star.
Eggleton Peter P.
Verbunt Frank
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