期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 442, 期 2, 页码 1440-1450出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu861
关键词
stars: AGB and post-AGB; supernovae: general; dust; extinction; ISM: evolution; Magellanic Clouds
资金
- European Research Council under the European Union [306476]
- National Science Council of Taiwan (NSC) [NSC102-2119-M-001-006-MY3]
- NSC [NSC100-2112-M-001-023-MY3]
We compare theoretical dust yields for stars with masses 1 a parts per thousand currency sign m(star) a parts per thousand currency sign 8 M-aS (TM) and metallicities 0.001 a parts per thousand currency sign Z a parts per thousand currency sign 0.008 with observed dust production rates (DPRs) using carbon-rich and oxygen-rich asymptotic giant branch (C-AGB and O-AGB) stars in the Large and Small Magellanic Clouds (LMC and SMC). The measured DPR of C-AGB stars in the LMC are reproduced only if the mass loss from AGB stars is very efficient during the carbon-star stage. The same yields overpredict the observed DPR in the SMC, suggesting a stronger metallicity dependence of the mass-loss rates during the carbon-star stage. The DPRs of O-AGB stars suggest that rapid silicate dust enrichment occurs as a result of efficient hot bottom burning if m(star) a parts per thousand yen 3 M-aS (TM) and Z a parts per thousand yen 0.001. When compared to the most recent observations, our models support a stellar origin for the existing dust mass, if no significant destruction in the interstellar medium occurs, with a contribution from AGB stars of 70 per cent in the LMC and 15 per cent in the SMC.
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