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Astron. Astrophys. 354, 125-134 (2000)

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Mass-loss rates and dust-to-gas ratios for obscured Asymptotic Giant Branch stars of different metallicities *

Jacco Th. van Loon

Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, United Kingdom

Received 8 July 1999 / Accepted 1 December 1999

Abstract

The mass-loss rates and dust-to-gas ratios of obscured Asymptotic Giant Branch (AGB) stars are investigated for samples with different initial metallicities: in the Small and Large Magellanic Clouds (SMC & LMC) and in the Milky Way. The properties of their circumstellar envelopes can be explained in a consistent way if, both for obscured M-type AGB stars and for obscured carbon stars, the total (gas+dust) mass-loss rate [FORMULA] depends only weakly on initial metallicity whilst the dust-to-gas ratio [FORMULA] depends approximately linearly on initial metallicity.

Key words: stars: circumstellar matter – stars: mass-loss – stars: AGB and post-AGB – stars: winds, outflows – galaxies: Magellanic Clouds – infrared: stars

* This paper is based in part on data obtained at the South-African Astronomical Observatory.

Send offprint requests to: Jacco van Loon (jacco@ast.cam.ac.uk)

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© European Southern Observatory (ESO) 2000

Online publication: January 31, 2000
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