Theoretical isochrones with decreasing gravitational constant - I.
Abstract
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
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- August 1976
- DOI:
- 10.1093/mnras/176.2.455
- Bibcode:
- 1976MNRAS.176..455V
- Keywords:
-
- Astronomical Models;
- Cosmology;
- Gravitational Constant;
- Lunar Occultation;
- Relativity;
- Globular Clusters;
- Loci;
- Time Constant;
- Astrophysics