Stellar encounters in the Galactic center - Formation of massive stars and close binaries

Details Stellar encounters in the Galactic center - Formation of massive stars and close binaries Stellar encounters in the Galactic center - Formation of massive stars and close binaries

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..688l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 688-697. NSERC-supported research.

Astronomy and Astrophysics

Astronomy

11

Binary Stars, Galactic Nuclei, Star Distribution, Star Formation, X Ray Sources, Infrared Astronomy, Main Sequence Stars, Neutron Stars, Stellar Evolution, White Dwarf Stars

Scientific paper

The rate of formation of tidally captured binaries in the Galactic center region is computed using the stellar density distribution based on near-infrared observations. Since the stellar velocity dispersion in the Galactic center (≡170 km s-1) is much higher than that in globular clusters (≡10 km s-1), the binaries formed in the Galactic center are tighter than those formed in the cores of globular clusters. Almost all of the tidally captured systems consisting of two main-sequence stars will have initial periastron separations less than the sum of their radii implying that stellar mergers are very likely to occur. The authors estimate that the integrated rate of tidal captures should be ≡4×10-5yr-1. The tidal capture mechanism can also produce X-ray binaries. Possible evolutionary sequences for these binaries are discussed and it is investigated whether the tidal capture mechanism can explain the number of X-ray sources observed in the galactic center.

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