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Issue A&A
Volume 430, Number 3, February II 2005
Page(s) 905 - 910
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20041565



A&A 430, 905-910 (2005)
DOI: 10.1051/0004-6361:20041565

Exploratory C star search in the disk of M 31 beyond 30 kpc

P. Battinelli1 and S. Demers2

1  INAF - Osservatorio Astronomico di Roma, Viale del Parco Mellini 84, 00136 Roma, Italia
    e-mail: battinel@oarhp1.rm.astro.it
2  Département de Physique, Université de Montréal, CP 6128, Succursale Centre-Ville, Montréal, Québec H3C 3J7, Canada
    e-mail: demers@astro.umontreal.ca

(Received 30 June 2004 / Accepted 4 October 2004 )

Abstract
In order to investigate how far the intermediate-age population of the disk of M 31 extends we survey 450 arcmin 2 along its southern major axis, from 35 kpc to 43 kpc. We identified a handful of C stars. We conclude that we have reached the edge of the M 31 disk, at least as defined by intermediate age stars. There is no evidence of density enhancement AGB stars related to the Ferguson clump possibly associated with cluster G1. Radial velocity measures could provide confirmation that the most remote C star, at 40 kpc, is indeed a member of the disk population of M 31.


Key words: galaxies: individual: M 31 -- galaxies: local group -- galaxies: structure -- stars: carbon

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© ESO 2005


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