Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...436...91d&link_type=abstract
Astronomy and Astrophysics, Volume 436, Issue 1, June II 2005, pp.91-99
Astronomy and Astrophysics
Astrophysics
4
Galaxies: Individual: M 31, Stars: Carbon
Scientific paper
We employ the CFHT Megacam camera to survey ~one deg2 of the southern outer disc of M 31, a region which includes the area where Battinelli et al. (2003, AJ, 125, 1298) have identified nearly one thousand C stars. In the outer M 31 region not previously surveyed, we identify 361 new C star candidates, having similar photometric properties to the known ones, and confirm the slight decrease in the luminosity of C stars with galactocentric distances. We show that the Sloan g', r', i' filters are a viable approach, comparable to (CN - TiO), to identify C stars. We find that the (g' - r') colours of cool C stars can be so red that prohibitively long g' exposures are needed to acquire faint extragalactic C stars. This makes the Sloan filters a less promising approach to extend a C star survey to several Mpc. Our uniform large field survey detects the edge of M 31 disk at ~35 kpc. The intermediate-age population, represented by C stars, extends further to ~40 kpc.
Battinelli Paolo
Demers Serge
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