Imaging of fields in the inner halo and outer disk of M31

Details Imaging of fields in the inner halo and outer disk of M31 Imaging of fields in the inner halo and outer disk of M31

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...409..190d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 190-198.

Astronomy and Astrophysics

Astrophysics

24

Andromeda Galaxy, Asymptotic Giant Branch Stars, Galactic Halos, Galactic Nuclei, Imaging Techniques, Star Formation, Chemical Evolution, Galactic Evolution, Main Sequence Stars, Red Giant Stars

Scientific paper

CCD images are here used to ascertain the stellar content of two fields which sample the outer disk and inner halo of M31. While, in the field which samples the outer disk, both a bright main-sequence component and luminous asymptotic giant branch stars are detected, the inner halo field exhibits a red giant branch which is wider than expected from observational uncertainties. It is established that the metallicity of the M31 halo is spatially homogeneous, even in regions lying close to the disk and bulge.

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