Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...411..285d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 411, no. 1, p. 285-297.
Astronomy and Astrophysics
Astrophysics
16
Binary Stars, Celestial Mechanics, Hydrodynamics, Main Sequence Stars, Neutron Stars, White Dwarf Stars, Energy Transfer, Globular Clusters, Red Giant Stars, Stellar Evolution
Scientific paper
We simulated encounters between a neutron star and primordial and tidal-capture binaries. In the case of encounters involving a tidal-capture binary, comprising a white dwarf and a main-sequence star, we find that most exchange encounters will produce a single merged object with the white dwarf and neutron star engulfed in a common envelope of gas donated by the main-sequence primary of the original binary. A small fraction of exchanges induce a merger of the white dwarf and main-sequence star, with this object being unbound to the neutron star, and the two objects having a large relative speed at infinity. For encounters involving a primordial binary, fewer encounters require the inclusion of hydrodynamical effects. Those involving collisions or close encounters tend to produce a binary comprised of the two merged stars (now forming one star) and the third star. The binaries produced typically have large enough separations to prevent the formation of a single merged object until subsequent stellar evolution of one of the components causes it to fill its Roche lobe. Clean exchanges produce binaries with large eccentricities; they are typically sufficiently wide to avoid circularization.
Benz Willy
Davies Melvyn B.
Hills Jack G.
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