Stellar populations in the inner halo of M31

Details Stellar populations in the inner halo of M31 Stellar populations in the inner halo of M31

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...331..135p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 1, 1988, p. 135-144.

Astronomy and Astrophysics

Astrophysics

63

Andromeda Galaxy, Halos, Metallicity, Milky Way Galaxy, Star Distribution, Blue Stars, Horizontal Branch Stars, Stellar Luminosity

Scientific paper

The CFH 3.6 m telescope has been used to study the stellar population of a field in the halo of M31 down to Blim = 26.4. A color magnitude diagram is constructed for a 2arcmin.2 × 3arcmin.3 field 40arcmin along the minor axis from the nucleus of M31. This field contains an almost pure halo population, with negligible contamination from the disk of M31. The M31 halo at this distance is found to consist of a stellar population with [Fe/H] ≈ -1.0, with a small but significant range in metallicity. The horizontal branch of the M31 halo must be predominantly short and red, since there is a negligible contribution from an M5-like blue horizontal branch. Consistency is found between the stellar content of the M31 halo and that of the Galactic globular cluster NGC 6171, in terms of mean metallicity, magnitude of the tip of the giant branch, horizontal branch morphology, and also normalized numbers of RR Lyrae stars.

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