The stellar population in the halos of M31 and M33

Details The stellar population in the halos of M31 and M33 The stellar population in the halos of M31 and M33

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..591m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 15, 1986, p. 591-599.

Astronomy and Astrophysics

Astrophysics

191

Andromeda Galaxy, Color-Magnitude Diagram, Halos, Metallicity, Spiral Galaxies, Stellar Spectrophotometry, Charge Coupled Devices

Scientific paper

Deep two-color (V and I) CCD photometry of stars in the halos of M31 and M33 is presented. The color-magnitude diagrams show the brightest 2 mag of the giant branches in the two galaxies. The M31 halo giant branch is very broad, indicating a large dispersion in metallicity, and the M33 halo giant branch is much narrower and less metal-rich; quantitative estimates for the mean values of M/H are -0.6 in M31 and -2.2 in M33. Comparisons of the observed brightness of the tips of the giant branches with the calibration of Frogel, Cohen, and Persson (1983) give distance moduli of 24.4 + or - 0.25 for M31 and 24.8 + or - 0.3 for M33.

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