Volume 367, Number 2, February IV 2001
|Page(s)||557 - 565|
|Section||Interstellar and circumstellar matter|
|Published online||15 February 2001|
A census of AGB stars in Local Group galaxies*
I. Photometry of a field in M 31
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
Corresponding author: W. Nowotny, email@example.com
Accepted: 5 December 2000
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
© ESO, 2001
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