Statistics – Computation
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238...95f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 95-110. Research supported by CNR and MPI.
Statistics
Computation
182
Globular Clusters, Metallicity, Red Giant Stars, Stellar Evolution, Stellar Luminosity, Color-Magnitude Diagram, Computational Astrophysics, Milky Way Galaxy, Stellar Magnitude, Stellar Models
Scientific paper
It is shown how a feature in the luminosity function of globular cluster red giants, the so-called red giant branch bump, can serve as a standard candle. Observational determinations of the bump magnitude are presented for a sample of galactic globular clusters. These lead to a new independent calibration for the slope of the M(v)HB, (Fe/H) relation. However, it is concluded that a definitive value for the globular cluster age dispersion cannot yet be obtained. It is pointed out how the coincidence of the observed bump with that predicted by standard models provides constraints on possible nonstandard stellar models and systematic error in the age scale.
Buonanno Roberto
Crocker Deborah A.
Ferraro Francesco R.
Fusi Pecci Flavio
Rood Robert T.
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