Standard globular cluster giant branches in the (MI,/V-I/sub O) plane

Details Standard globular cluster giant branches in the (MI,/V-I/sub O) plane Standard globular cluster giant branches in the (MI,/V-I/sub O) plane

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..162d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, July 1990, p. 162-181.

Astronomy and Astrophysics

Astronomy

424

Abundance, Astronomical Photometry, Asymptotic Giant Branch Stars, Color-Magnitude Diagram, Globular Clusters, Bolometers, Charge Coupled Devices, Heavy Elements, Metallicity, Stellar Color, Stellar Magnitude

Scientific paper

CCD photometry in the V, I (Cousins) bandpasses is presented for a large number of giants in eight galactic globular clusters. The (V-I)sub O color of the giant branch accurately ranks clusters in metal abundance, and can accordingly be used to ascertain both metal abundances and abundance dispersions in old stellar populations. A relation is derived that yields the bolometric correction to the I magnitude for red giants as a function of (V-I)sub O color. With this relation, and the assumption of the LDZ distance scale, the bolometric magnitudes of the brightest red giants in the clusters were determined; good agreement is obtained with the predictions of stellar evolution theory for the luminosity of the He core flash.

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