The Galactic globular cluster system - Empirical relationship between light-to-mass ratio and metallicity

Details The Galactic globular cluster system - Empirical relationship between light-to-mass ratio and metallicity The Galactic globular cluster system - Empirical relationship between light-to-mass ratio and metallicity

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..260c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 260-264.

Astronomy and Astrophysics

Astrophysics

6

Globular Clusters, Mass To Light Ratios, Metallicity, Milky Way Galaxy, Cepheid Variables, Horizontal Branch Stars, Light Curve

Scientific paper

The light-to-mass ratio A of the ab-type RR Lyrae stars in a wide sample of Galactic globular cluster is calculated using the period and the blue amplitude of the light curve. It is shown that the average A(12) depends on the metallicity as well as the horizontal-branch (HB) morphology of the cluster, in full agreement with the predictions of synthetic HB models at constant helium. If clusters with not extremely blue HB are taken into account, then the average A(12)-(Fe/H) relationship has a slope of about -0.05. If the clusters with very blue HB are included then the resulting slope turns out to be steeper and closer to the value found in the field. Such a result would confirm the suggestion that many metal-poor variables in the field are highly evolved stars from the blue side of the RR Lyrae gap. The whole globular cluster system seems to generally follow on average the same A-(Fe/H) correlation found for the Lub variables in the field.

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