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Photometric and Spectroscopic Observations of Globular Clusters in the Andromeda Nebula

1969; Institute of Physics; Volume: 19; Linguagem: Inglês

10.1086/190202

1538-4365

Sidney van den Bergh,

Astrophysics and Star Formation Studies

view Abstract Citations (253) References (56) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Photometric and Spectroscopic Observations of Globular Clusters in the Andromeda Nebula van den Bergh, Sidney Abstract The 200-inch telescope has been used to obtain classification spectra, radial velocities, and UB V photometry for the brightest clusters in M31. The principal results of this study are: 1. The average metallicity of globular clusters in the Andromeda Nebula is significantly higher than it is in the Galaxy. 2. There is no clear-cut evidence for a dependence of cluster metallicity on position. Some quite strong-lined clusters occur far out in the halo of M3 1. 3. Most of the stars in the inner halo of M31 are not extremely metal-poor. These results may indicate that much of the heavy-element enrichment in M31 took place before the collapse of the proto-Andromeda Nebula. Available evidence indicates that the globular clusters in M3I are systematically brighter than those in the Galaxy and in M87. This suggests that considerable caution should be exercised in using globular clusters to determine the scale of extragalactic distances. Siz different methods of distance determination yield (H) = 104 km Mpc-'. The best 200-inch plates provide marginal evidence in favor of the view that the red-giant stars in M31 globular clusters obey the same relation between metal abundance and luminosity as do their counterparts in globular clusters in the Galaxy. Available data suggest that A v/ <3.0 in the Andromeda Nebula. Observations of the globular clusters associated with the Fornax System are given in the Appendix. These observations show that the globular clusters in Fornax exhibit (1) a significant range in metallicity and (2) a very low average metal abundance. Publication: The Astrophysical Journal Supplement Series Pub Date: December 1969 DOI: 10.1086/190202 Bibcode: 1969ApJS...19..145V full text sources ADS | data products NED (142) SIMBAD (4)