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

Journal Article · Sat Oct 01 00:00:00 EDT 1988 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114880· OSTI ID:6539385

Heasley, J N; Friel, E D; Christian, C A; Janes, K A

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. 40 references.

• Research Organization: Hawaii Univ., Honolulu (USA); Canada-France-Hawaii Telescope Corp., Kamuela; Boston Univ., MA (USA)
• OSTI ID: 6539385
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 96; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHEMICAL COMPOSITION
CONFIGURATION
ELEMENTS
GALAXIES
HYDROGEN
IRON
MAGELLANIC CLOUDS
METALS
NONMETALS
PHOTOMETRY
SPIRAL CONFIGURATION
STAR CLUSTERS
STAR EVOLUTION
TRANSITION ELEMENTS