Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977aj.....82..626h&link_type=abstract
Astronomical Journal, vol. 82, Aug. 1977, p. 626-630.
Astronomy and Astrophysics
Astrophysics
21
Astrophysics, Binary Stars, Stellar Systems, Black Holes (Astronomy), Chemical Composition, Globular Clusters, Mass Transfer, Open Clusters, Orbital Elements, Stellar Mass, Stellar Mass Ejection, X Ray Binaries, X Ray Stars
Scientific paper
The probability is calculated that existing binaries in various stellar systems have suffered exchange collisions with single stars. After such a collision the former single star is one of the new binary components, while the star it replaces is ejected from the binary. In the solar neighborhood, about one visual binary in 1000 has a nonprimordial stellar component which it captured from the general field. The two stellar components of such a binary can have very different ages and chemical compositions. Dynamically, such binaries are indistinguishable from primordial binaries except for their high average orbital eccentricities. It is likely that many of the X-ray binaries in the Galactic disk and bulge have captured their relativistic components by exchange collisions. In open clusters most binaries with semimajor axes of at least about 1000 AU have suffered one or more exchange collisions. In the cores of dense globular clusters, this is true for binaries with semimajor axes of at least approximately 1 AU.
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