Theoretical isochrones with decreasing gravitational constant. I

Details Theoretical isochrones with decreasing gravitational constant. I Theoretical isochrones with decreasing gravitational constant. I

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176..455v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 176, Aug. 1976, p. 455-461.

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Computation

13

Astronomical Models, Cosmology, Gravitational Constant, Lunar Occultation, Relativity, Globular Clusters, Loci, Time Constant

Scientific paper

Van Flandern (1975) has postulated a variation of the gravitational constant at the approximate rate of -8 x 10 to the -11th power/yr. This variation, consistent with Hoyle-Narlikar and Dirac cosmologies, has been assumed in the computation of a 5-billion-year theoretical isochrone. Present results show that, even for this age, theory predicts a cluster turnoff luminosity about 0.5-1.0 mag fainter than the observed turnoffs of globular clusters. Unsatisfactory agreement between theoretical and observed luminosity functions is also indicated

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