| Issue |
A&A
Volume 367, Number 2, February IV 2001
|
|
|---|---|---|
| Page(s) | 557 - 565 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20000463 | |
| Published online | 15 February 2001 | |
A census of AGB stars in Local Group galaxies*
I. Photometry of a field in M 31
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
Corresponding author: W. Nowotny, nowotny@astro.univie.ac.at
Received:
23
August
2000
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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