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Mass-loss properties of S-stars on the AGB
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- Ramstedt, Sofia (author)
- Stockholms universitet,Institutionen för astronomi
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- Schöier, Fredrik (author)
- Stockholms universitet,Institutionen för astronomi
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- Olofsson, Hans (author)
- Stockholms universitet,Institutionen för astronomi
- show more...
- Lundgren, Andreas (author)
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- (creator_code:org_t)
- 2006-07-11
- 2006
- English.
- In: Astronomy & Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 454:2, s. L103-L106
- Journal article (peer-reviewed)
Abstract
Subject headings
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- We have used a detailed non-LTE radiative transfer code to model new APEX CO(J = 3 → 2) data, and existing CO radio line data, on a sample of 40 AGB S-stars. The derived mass-loss-rate distribution has a median value of 2 × 10-7~Mȯ yr-1, and resembles values obtained for similar samples of M-stars and carbon stars. Possibly, there is a scarcity of high-mass-loss-rate (≥10-5~Mȯ yr-1) S-stars. The distribution of envelope gas expansion velocities is similar to that of the M-stars, the median is 7.5 km s-1, while the carbon stars, in general, have higher gas expansion velocities. The mass-loss rate correlates well with the gas expansion velocity, in accordance with results for M-stars and carbon stars.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: AGB and post-AGB
- stars: circumstellar matter
- stars: late-type
- stars: mass-loss
- Formation and development of stars
- Stjärnors bildning och utveckling
Publication and Content Type
- ref (subject category)
- art (subject category)
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