The physics and chemistry of circumstellar envelopes of S-stars on the AGB

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dc.creatorRamstedt, S.
dc.creatorSchoeier, F. L.
dc.creatorOlofsson, H.
dc.date2007-06-18
dc.date.accessioned2026-07-07T08:10:46Z
dc.date.available2026-07-07T08:10:46Z
dc.descriptionThe S-stars have been suggested to be a brief transitional phase as stars evolve from oxygen-rich M-type stars into carbon stars, through the dredge up of carbon from He-shell burning. As possible transition objects, S-stars might help achieve a deeper understanding of the chemical evolution as a star ascends the AGB, as well as shed more light on the mass-loss mechanism. We have initiated a large survey of 40 S-stars to observe line emission in common molecules such as CO, SiO, HCN, CS and SiS. Detailed radiative transfer modelling of multi-transition CO radio line observations towards a sample of 40 S-stars shows that the mass-loss rate distribution of S-stars is consistent with those found for M-type AGB stars and carbon stars. Initial results from modelling of the circumstellar SiO emission are also presented.
dc.description2 pages, 1 figure, to appear in Proceedings from 'Why Galaxies Care About AGB stars'
dc.identifierhttps://arxiv.org/abs/0706.2559
dc.identifierhttp://arxiv.org/abs/0706.2559
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/131918
dc.subjectAstrophysics
dc.titleThe physics and chemistry of circumstellar envelopes of S-stars on the AGB
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