Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725011a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #250.11; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The chemical evolution of dust expelled from Asymptotic Giant Branch (AGB) stars is influenced by the Carbon to Oxygen (C/O) ratio, because of the high stability of Carbon Monoxide (CO). S Stars are thought to be "in between” Carbon-rich AGB stars and Oxygen-rich AGB stars, having a C/O ratio of near unity and thus are expected to have interesting dust properties. However, there is not a precise definition for S Stars. S Stars are currently defined by the molecular bands in their spectra; they have reasonably strong zirconium oxide (ZrO) bands, which are believed to be indicative of dredge-up of s-process nucleosynthesis products. However, production and dredge-up of s-process elements may not scale with the production and dredge up of s-process elements such as Zirconium (Zr), especially when we consider destruction of carbon through hot bottom burning. If we are to understand the effect of chemistry, either in terms of s-process enhancements or C/O ratios, we must be able to characterize our sample stars and thus a more precise definition of S Stars is needed.
Preliminary studies are presented to understand the properties of S Stars by determining what relationships exist between C/O ratios and s-process elements abundances.
Arrant David J.
Speck Angela
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