A Carbon Star Survey of the Local Group Dwarf Galaxies. II. Pegasus, DDO 210, and Tucana
Abstract
We present the latest results of our ongoing four-filter photometric survey of C stars in Local Group dwarf irregular galaxies. Observations of the two low-luminosity dwarf irregular galaxies, Pegasus and DDO 210, revealed 40 and three C stars, respectively, assuming that the reddening of Pegasus is negligible. No C stars were identified in Tucana. Our observations permit the estimation of the color-magnitude diagram contamination by foreground M dwarfs thus yielding reliable C/M ratios. Our R and I photometry of the C stars cannot be used to solve the extinction controversy toward Pegasus. The three C stars in DDO 210 are quite bright when compared with C star populations in other dwarf galaxies. A larger, fainter population in that galaxy seems improbable, however. The statistics of C stars currently on hand for dwarf galaxies show a well-defined trend with the absolute magnitude of dwarf galaxies.
- Publication:
-
The Astronomical Journal
- Pub Date:
- October 2000
- DOI:
- 10.1086/301546
- arXiv:
- arXiv:astro-ph/0008061
- Bibcode:
- 2000AJ....120.1801B
- Keywords:
-
- galaxies: individual (DDO 210;
- Pegasus;
- Tucana);
- Galaxies: Stellar Content;
- Stars: Carbon;
- Astrophysics
- E-Print:
- 18 pages, 7 figures, 6 tables