Theoretical models for wide binary evolution

Details Theoretical models for wide binary evolution Theoretical models for wide binary evolution

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988ap%26ss.142..267w&link_type=abstract

(IAU, Colloquium on Wide Components in Double and Multiple Stars, 97th, Brussels, Belgium, June 8-13, 1987) Astrophysics and Spa

Physics

7

Binary Stars, Star Distribution, Stellar Evolution, Stellar Models, Stellar Physics, Molecular Clouds, Stellar Orbits

Scientific paper

Wide binary evolution under the influence of stars, giant molecular clouds, and the galactic tidal field is reviewed. Recent results show that binary lifetimes at a of greater than about 0.1 pc are determined by an interplay between relatively gentle evolution due to stellar encounters and catastrophic collisions with cloud subclumps. It is emphasized that binary semimajor axis distributions may not be understood from lifetimes alone. To determine the theoretical distribution, binary 'birthrate functions' must be convolved with probability distributions for the evolution of an ensemble of binaries from given initial separations. Simple models show no sharp breaks below the tidal cut-off imposed by the Galaxy.

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