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Pulsation properties of C stars in the Small Magellanic Cloud

Authors :
Raimondo, G.
L. Cioni, M.-R.
Rejkuba, M.
Silva, D. R.
Raimondo, G.
L. Cioni, M.-R.
Rejkuba, M.
Silva, D. R.
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