Query : 2011A&A...530A...8W

2011A&A...530A...8W - Astronomy and Astrophysics, volume 530A, 8-8 (2011/6-1)

Oxygen- and carbon-rich variable red giant populations in the Magellanic Clouds from EROS, OGLE, MACHO, and 2MASS photometry.


Abstract (from CDS):

The carbon-to-oxygen (C/O) ratio of asymptotic giant branch (AGB) stars constitutes an important index of evolutionary and environment/metallicity factor. We develop a method for mass C/O classification of AGBs in photometric surveys without using periods.For this purpose we rely on the slopes in the tracks of individual stars in the colour-magnitude diagram.We demonstrate that our method enables the separation of C-rich and O-rich AGB stars with little confusion. For the Magellanic Clouds we demonstrate that this method works for several photometric surveys and filter combinations. As we rely on no period identification, our results are relatively insensitive to the phase coverage, aliasing, and time-sampling problems that plague period analyses. For a subsample of our stars, we verify our C/O classification against published C/O catalogues. With our method we are able to produce C/O maps of the entire Magellanic Clouds.Our purely photometric method for classification of C- and O-rich AGBs constitutes a method of choice for large, near-infrared photometric surveys. Because our method depends on the slope of colour-magnitude variation but not on magnitude zero point, it remains applicable to objects with unknown distances.

Abstract Copyright:

Journal keyword(s): methods: data analysis - techniques: photometric - surveys - stars: oscillations - stars: AGB and post-AGB - Magellanic Clouds

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 3936 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11227 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7127 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17552 0
5 2MASS J05244685-6949501 LP* 05 24 46.8572325000 -69 49 50.134793088     16.85 14.528 14.355 M 9 0
6 2MASS J05261809-6940597 LP* 05 26 18.0958395360 -69 40 59.894491620     17.28 14.190 14.090 C 9 0

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