Journal Article

Dusty winds – II. Observational implications

Željko Ivezić and Moshe Elitzur

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 404, issue 3, pages 1415-1424
Published in print May 2010 | ISSN: 0035-8711
Published online May 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16348.x
Dusty winds – II. Observational implications

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We compare observations of asymptotic giant branch stars and predictions of the Elitzur & Ivezić steady-state radiatively driven dusty wind model. The model results are described by a set of similarity functions of a single independent variable, and imply general scaling relations among the system parameters. We find that the model properly reproduces various correlations among the observed quantities and demonstrates that dust drift through the gas has a major impact on the structure of most winds. From data for nearby oxygen-rich and carbon-rich mass-losing stars we find that (1) the dispersion in grain properties within each group is rather small; (2) both the dust cross-section per gas particle and the dust-to-gas mass ratio are similar for the two samples even though the stellar atmospheres and grain properties are very different; (3) the dust abundance in both outflows is significantly below the Galactic average, indicating that most of the Galactic dust is not stardust – contrary to popular belief, but in support of Draine. Our model results can be easily applied to recent massive data sets, such as the Spitzer SAGE survey of the Large Magellanic Cloud, and incorporated in galaxy evolution models.

Keywords: stars: AGB and post-AGB; stars: late-type; stars: mass-loss; winds, outflows; dust, extinction; infrared: stars

Journal Article.  7472 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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