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Pulsation properties of C stars in the Small Magellanic Cloud
- Source :
- Astronomy and Astrophysics; August 2005, Vol. 438 Issue: 2 p521-532, 12p
- Publication Year :
- 2005
-
Abstract
- A sample of carbon-rich stars (C-stars) in the Small Magellanic Cloud (SMC) was selected from the combined 2MASS and DENIS catalogues on the basis of their $J-K_{\rm s}$colour. This sample was extended to include confirmed C-stars from the Rebeirot et al. (1993) spectroscopic atlas. In this combined sample (N= 1149), a smaller number (N= 1079) were found to have MACHO observations. For this sub-sample, light curves were determined and 919 stars were found to have high quality light-curves with amplitudes of at least 0.05 mag. Of these stars, only 4% have a well-defined single period – most of these have multiple well-defined periods, while 15% have highly irregular light-curves. The distribution of the logarithm of the period versus magnitude, colour, period ratio (if applicable), and amplitude was analyzed and compared with previous works. Variable C-stars are distributed in three sequences: B, C, and Dfrom Wood et al. (1999), and do not populate sequences with periods shorter than $\log P \sim 1.5$. Stellar ages and masses were estimated using stellar evolutionary models.
Details
- Language :
- English
- ISSN :
- 00046361 and 14320746
- Volume :
- 438
- Issue :
- 2
- Database :
- Supplemental Index
- Journal :
- Astronomy and Astrophysics
- Publication Type :
- Periodical
- Accession number :
- ejs53198624
- Full Text :
- https://doi.org/10.1051/0004-6361:20041904