Realistic models for evolving globular clusters. II - POST core collapse with a mass spectrum

Details Realistic models for evolving globular clusters. II - POST core collapse with a mass spectrum Realistic models for evolving globular clusters. II - POST core collapse with a mass spectrum

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..335m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 335-349.

Astronomy and Astrophysics

Astronomy

88

Astronomical Models, Fokker-Planck Equation, Globular Clusters, Gravitational Collapse, Mass Spectra, Stellar Evolution, Binary Stars, Star Clusters, Stellar Mass

Scientific paper

The evolution of globular cluster is modeled past core collapse by direct integration of the multimass Fokker-Planck equation. This model includes a realistic mass spectrum of stars with masses ranging from 0.1 to 1.2 solar mass. The effects of heating due to the formation and subsequent hardening of three-body binaries are taken into account. It is found that including a mass spectrum significantly suppresses the large-amplitude oscillations that previously had been observed in single-mass calculations. Oscillations are not seen in the evolutions until the number of stars in the cluster is on the order of 80,000 solar masses, of which about 2000 are in the heaviest nonluminous remnants for a model with seven mass groups and a Salpeter-like mass function. For a model with 400,000 solar masses, the amplitude of the central density oscillations varies from 1000 the heavy remnants to 5 for the lowest-mass stars. A flat mass function is much more likely to be unstable than a steep mass function.

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