Computer Science
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30737h&link_type=abstract
Spitzer Proposal ID #30737
Computer Science
Scientific paper
We propose to perform and IRS survey of an unbiased sample of S-type AGB stars. It is expected that the dust production around those stars, with a carbon-to-oxygen ratio near unity, differs significantly from oxygen- and carbon-rich AGB stars, due to their specific abundance pattern. The objective of the survey is to determine the composition and amount of the dust that these stars produce. The S stars are not yet well covered observationally in the IR. Spitzer with its unique sensitivity allows to build an important observational dataset in a modest amount of time. The proposed observations will probe: i) How much dust is present. ii) The composition of the dust. iii) Dust mass-loss rates. iv) The dependence of the dust parameters on the stellar parameters. These observations will thus provide a complete census of S-star dusty winds. Using these results we will study the following questions: i: wind driving)} Is the amount of dust sufficient to drive a stellar wind? ii: dust condensation)} How well do we understand dust formation? The observations will provide a strong gauge point for dust condensation theory. The size of the sample (90 objects) is driven by the need to cover the range of C/O ratios from MS to CS stars, stellar temperatures and all relevant pulsations types. The total requested time amounts to 19.7 hours.
Blommaert Joris
Decin Leen
Feast Michael
Groenewegen Martin
Hony Sacha
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