Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..994l&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 102, Sept. 1991, p. 994-1004. Research supported by NSERC and Isaak Walton Killam Tr
Astronomy and Astrophysics
Astronomy
47
Binary Stars, Blue Stars, Globular Clusters, Stellar Evolution, Companion Stars, Main Sequence Stars, Mass Transfer, Stellar Mass
Scientific paper
The present study tests the hypothesis that the blue stragglers in the low-density globular clusters are the result of physical stellar collisions during strong interactions involving primordial binary stars. Unlike the earlier study by Leonard (1989), stars were allowed in the present simulation to instantly merge if they touched. It was found that the collisions which are the best at producing merged stars that would remain bound to NGC 5053 are those between binaries with periods exceeding 100 days. A spectrum of binary mass ratios peaked at equal masses resulted in only a slight improvement in the production rate compared with a uniform distribution of mass ratios. Binary-single collisions are much less effective than binary-binary collisions at producing merged stars. The collisions-of-binaries mechanism has less difficulty accounting for blue stragglers in NGC 5466 than it does in NGC 5053 due to the much higher central density of the former cluster.
Fahlman Gregory G.
Leonard Peter J. T.
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