A census of AGB stars in Local Group galaxies

Free access article

Issue		A&A Volume 367, Number 2, February IV 2001


Page(s)		557 - 565
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20000463

A&A 367, 557-565 (2001)
DOI: 10.1051/0004-6361:20000463

I. Photometry of a field in M 31

W. Nowotny¹, F. Kerschbaum^{1, 2}, H. E. Schwarz³ and H. Olofsson²

¹ Institut für Astronomie der Universität Wien, Türkenschanzstraße 17, 1180 Wien, Austria
² Stockholms Observatorium, 13336 Saltsjöbaden, Sweden
³ Nordic Optical Telescope, Apartado 474, 38700 Sta Cruz de La Palma, Canarias, Spain

(Received 23 August 2000 / Accepted 5 December 2000)

Abstract
We present four colour CCD photometry of a field in M 31. Observations were carried out in two broad band filters (V and i) and two special narrow band "Wing"filters centered on a TiO and a CN molecular band. Colour-magnitude diagrams constructed from broad band photometry show the sequence of RGB/AGB stars. Three known Cepheid variables could be identified on our frames. We used colour-colour diagrams to identify the M- and C-type AGB stars and to investigate e.g. the luminosity function of the AGB population. We found 61 new extragalactic C-stars in this field of M 31.

Key words: stars: asymptotic giant branch (AGB) -- stars: carbon -- galaxies: individual: M 31 -- galaxies: stellar content -- techniques: photometric -- surveys

Offprint request: W. Nowotny, nowotny@astro.univie.ac.at

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