A census of AGB stars in Local Group galaxies I. Photometry of a field in M 31
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. Based on observations made with the Nordic Optical Telescope operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.}
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 2001
- DOI:
- 10.1051/0004-6361:20000463
- Bibcode:
- 2001A&A...367..557N
- Keywords:
-
- STARS: ASYMPTOTIC GIANT BRANCH (AGB);
- STARS: CARBON;
- GALAXIES: INDIVIDUAL: M 31;
- GALAXIES: STELLAR CONTENT;
- TECHNIQUES: PHOTOMETRIC;
- SURVEYS