Photometry of giant-branch stars in the M31 globular cluster G1

Details Photometry of giant-branch stars in the M31 globular cluster G1 Photometry of giant-branch stars in the M31 globular cluster G1

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96.1312h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, Oct. 1988, p. 1312-1318.

Astronomy and Astrophysics

Astronomy

27

Asymptotic Giant Branch Stars, Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Infrared Spectroscopy, Astronomical Photometry, Chemical Composition, Magellanic Clouds, Spiral Galaxies, Stellar Evolution

Scientific paper

The first deep two-color (V and I) CCD photometry of individual stars in a M31 globular cluster is presented. The color-magnitude diagram for the stars in cluster G1 shows the brightest two magnitudes of a well-defined giant branch. The position of the giant branch in color indicates that G1 has a metallicity Fe/H abundance ratio of about -0.7, consistent with estimates from spectroscopy of its integrated light. The giant branch of G1 falls roughly in the middle of the range occupied by the halo field stars in M31. Thus, both the photometry and integrated-light spectroscopy show that G1 appears to be near the mean metallicity of the M31 halo population.

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