Encounters between compact stars and red giants in dense stellar systems

Details Encounters between compact stars and red giants in dense stellar systems Encounters between compact stars and red giants in dense stellar systems

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...354..201r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 354, May 1, 1990, p. 201-210.

Statistics

Computation

12

Binary Stars, Computational Astrophysics, Many Body Problem, Neutron Stars, Red Giant Stars, Stellar Systems, Globular Clusters, Main Sequence Stars, Stellar Cores, Stellar Envelopes, Stellar Evolution, Stellar Mass Ejection

Scientific paper

The results of some representative N-body simulations of encounters between a red giant star and a compact object are presented. An overview is given of all the different possible outcomes that can be produced by the encounters. How the numerical data on individual encounters can be used to calculate the binary formation rate in globular clusters is discussed, and it is argued that the usual simple estimates based on the tidal approximation can sometimes give incorrect results. The calculation of probability distributions for the semimajor axes and eccentricities of the binaries that are formed, as a function of globular cluster parameters, is discussed. It is shown that encounters with stars on the subgiant branch might very well lead to the formation of close binaries with large eccentricity, such as those recently reported in 47 Tuc and M15. In addition, the binaries resulting from encounters with stars on the red giant branch could be an important source of heating during the late stages of evolution of a globular cluster.

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