Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..445..209s&link_type=abstract
Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants. Proceedings of a conference held at University Ca
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a set of Spitzer IRS spectra (5-35 μm) of a sample of intrinsic S stars, covering the entire MS-S-SC sequence. We acknowledge that, due to the selection criteria employed, the sample is biased towards lower mass-loss rates. Most stars do not show significant emission features. For the dust-rich stars, we can conclude that the dust resembles the dust around M stars, with alumina, silicates and magnesium-iron-oxides as the strongest emission features. Furthermore, we detect PAH emission features in four S stars and confirm the correlation between the temperature of the central star and the centroid wavelength of the 7.9 μm feature. We argue that the mixture of hydrocarbons we see in these S stars has a rich aliphatic component.
Blommaert Joris
Decin Leen
Hony Sacha
Sloan Greg
Smolders Kristof
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