The ages of globular clusters and the Sandage period-shift effect

Details The ages of globular clusters and the Sandage period-shift effect The ages of globular clusters and the Sandage period-shift effect

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216...80b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 80-108. Research supported by CNR and MPI.

Astronomy and Astrophysics

Astrophysics

259

Astronomical Photometry, Globular Clusters, Stellar Evolution, Cyanogen, Horizontal Branch Stars, Hydrogen, Iron, Main Sequence Stars, Metallicity

Scientific paper

Previous color-magnitude diagrams are used to determine the ages of 19 globular clusters, and a technique for calibrating the age vs difference in magnitude between the main-sequence turnoff (TO) and horizontal branch (HB) at the RR Lyrae gap, Delta V (TO-HB), diagram is used to investigate the dependence of the absolute luminosity of the HB on metallicity and to check the Sandage (1986) period-shift effect. Delta V (TO-HB) is found to be 3.55 + or - 0.09 for all the clusters, independent of the Fe/H abundance ratio. Cluster ages depend on the zero-point of the MV (HB) vs Fe/H abundance ratio relation, and a mean absolute age of the clusters of 19 + or - 3 Gyr is implied.

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