Implications of helium diffusion for globular cluster isochrones and luminosity functions

Details Implications of helium diffusion for globular cluster isochrones and luminosity functions Implications of helium diffusion for globular cluster isochrones and luminosity functions

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apjs...77..473p&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 77, Dec. 1991, p. 473-514. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

74

Globular Clusters, Helium, Stellar Evolution, Stellar Luminosity, Abundance, Diffusion, Stellar Interiors

Scientific paper

This study presents grids of evolutionary sequences for masses from 0.5 and 1.0 solar mass and Fe/H metallicities of -2.26, -1.26, and -0.65 computed both with and without the inclusion of diffusion. These are interpolated to produce isochrones, for ages from 10 to 18 Gyr, and associated luminosity functions, for several power-law mass functions. The resultant age-luminosity relations indicate that the gravitational settling of helium can reduce the age at a given turnoff luminosity by about 10 percent, with considerably larger effects on turnoff temperatures and colors. Differences in the shapes of the luminosity functions from canonical models and those which included diffusion were found to be so small as to be observationally undetectable. Extensive tables of tracks, isochrones, and luminosity functions are provided.

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