Mass-loss properties of S-stars on the AGB
2006 (English)In: Astronomy & Astrophysics, ISSN 0004-6361, Vol. 454, no 2, L103-L106 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2006. Vol. 454, no 2, L103-L106 p.
stars: AGB and post-AGB, stars: circumstellar matter, stars: late-type, stars: mass-loss
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-20159DOI: doi:10.1051/0004-6361:20065285OAI: oai:DiVA.org:su-20159DiVA: diva2:186684