The stellar populations of M 31

Details The stellar populations of M 31 The stellar populations of M 31

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1053v&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Oct. 1991, p. 1053-1068.

Physics

46

Andromeda Galaxy, Galactic Nuclei, Star Distribution, Stellar Physics, Astronomical Spectroscopy, Color-Magnitude Diagram, Galactic Bulge, Globular Clusters, Interstellar Extinction, Metallicity

Scientific paper

Data on stellar populations in the Andromeda nebula = M31 = NGC 224 are reviewed. The high rotational velocity and large velocity dipersion observed in the semistellar nucleus of the Andromeda nebula indicate that it contains a compact mass of about 10 exp 7 solar masses. It is suggested that the high mass-to-light ratio observed in the nucleus of M31 is due to a dwarf-enriched mass spectrum of star formation. The halo of M31 is found to be rich in RR Lyrae stars which belong to Oosterhoff type I. The color-magnitude diagram of the halo of M31 appears to show that the blue horizontal-branch population is weak.

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