Carbon Star Survey in the Local Group. V. The Outer Disk of M31

Details Carbon Star Survey in the Local Group. V. The Outer Disk of M31 Carbon Star Survey in the Local Group. V. The Outer Disk of M31

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....125.1298b&link_type=abstract

The Astronomical Journal, Volume 125, Issue 3, pp. 1298-1308.

Astronomy and Astrophysics

Astronomy

27

Galaxies: Individual: Messier Number: M31, Galaxies: Stellar Content, Galaxies: Structure, Stars: Carbon

Scientific paper

We employ the CFH12K mosaic to identify carbon stars, using the R, I, CN, and TiO photometric technique, in a 2240 arcmin2 area, ranging from 17 to 30 kpc of the southwest disk of M31, barely reaching the edge of the observed H I disk. We found 945 C stars with =19.94 and σ=0.47. The surface density of C stars along the major axis of M31 follows an exponential profile with a scale length of 4.85+/-0.35 kpc, in agreement with adopted values for the scale length of the disk population. Our survey partially overlaps with the recently discovered G1 density enhancement by Ferguson et al. We confirm that no AGB star excess is detectable in the surveyed part of the clump. The C/M ratio, along the major axis, is derived over a distance range of 7 kpc. The strong C/M gradient seen contrasts with results of previous studies of the C stars in M31.

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