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Astronomy and Astrophysics 421 (2004) 509-518
Variable stars towards the bulge of M31: the AGAPE catalogue
R. Ansari1, M. Auriere2, P. Baillon3, A. Bouquet4, G. Coupinot2, Ch. Coutures5, C. Ghesquiere4, Y. Giraud-Heraud4, D. Gillieron2, P. Gondolo, J. Hecquet2, J. Kaplan4, A. Kim4, Y. Le Du4, A.L. Melchior6, M. Moniez1, J.P. Picat2, G. Soucail2
For the AGAPE collaboration(s)

We present the AGAPE astrometric and photometric catalogue of 1579 variable stars in a 14'x10' field centred on M31. This work is the first survey devoted to variable stars in the bulge of M31. The R magnitudes of the objects and the B-R colours suggest that our sample is dominated by red long-period variable stars (LPV), with a possible overlap with Cepheid-like type II stars. Twelve nova candidates are identified. Correlations with other catalogues suggest that 2 novae could be recurrent novae and provide possible optical counterparts for 2 supersoft X-ray sources candidates observed with Chandra.
1:  LAL - Laboratoire de l'Accélérateur Linéaire
2:  LATT - Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées
3:  CERN - European Organization for Nuclear Research
4:  PCC - Physique Corpusculaire et Cosmologie - Collège de France
5:  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
6:  LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
Physics/Astrophysics/Cosmology and Extra-Galactic Astrophysics

Sciences of the Universe/Astrophysics
galaxies: individual: M 31 – cosmology: dark matter – stars: variables: general – stars: novae – cataclysmic variables – stars: variables: Cepheids – X-rays: stars
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