The VMC survey III. Mass-loss rates and luminosities of LMC AGB stars

Details The VMC survey III. Mass-loss rates and luminosities of LMC AGB stars The VMC survey III. Mass-loss rates and luminosities of LMC AGB stars

2011-10-20

arxiv.org/abs/1110.4497v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, 10 figures. Accepted for publication in A&A

Scientific paper

Dust radiative transfer models are presented for all 374 AGB stars candidates in one of the fields observed by the new VISTA survey of the Magellanic Clouds (VMC). Mass-loss rates, luminosities and a classification of C- and O-rich stars are derived by fitting the models to the spectral energy distribution obtained by combining VMC data with existing optical, near-, and mid-infrared photometry. This exploratory study shows that our method provides reliable mass-loss rates, luminosities and chemical classifications for all AGB stars. These results offer already important constraints to AGB evolutionary models. Most of our conclusions, especially for the rarer dust-enshrouded extreme AGB stars, are however strongly limited by the relatively small area covered by our study. Forthcoming VMC observations will easily remove this limitation. [abridged]

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