Mass-loss rates and dust-to-gas ratios for obscured Asymptotic Giant Branch stars of different metallicities *
Jacco Th. van Loon
Received 8 July 1999 / Accepted 1 December 1999
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 depends only weakly on initial metallicity whilst the dust-to-gas ratio 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
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© European Southern Observatory (ESO) 2000
Online publication: January 31, 2000