The detached dust shells of AQ Andromedae, U Antliae, and TT Cygni

Detached circumstellar dust shells are detected around three carbon variables using Herschel-PACS. Two of them are already known on the basis of their thermal CO emission and two are visible as extensions in IRAS imaging data. By model fits to the new data sets, physical sizes, expansion timescales,...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2010-07, Vol.518 (1), p.L140
Main Authors: Kerschbaum, F., Ladjal, D., Ottensamer, R., Groenewegen, M. A. T., Mecina, M., Blommaert, J. A. D. L., Baumann, B., Decin, L., Vandenbussche, B., Waelkens, C., Posch, T., Huygen, E., De Meester, W., Regibo, S., Royer, P., Exter, K., Jean, C.
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
infrared: stars
stars: AGB and post-AGB
stars: carbon
stars: evolution
stars: mass-loss
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Summary:Detached circumstellar dust shells are detected around three carbon variables using Herschel-PACS. Two of them are already known on the basis of their thermal CO emission and two are visible as extensions in IRAS imaging data. By model fits to the new data sets, physical sizes, expansion timescales, dust temperatures, and more are deduced. A comparison with existing molecular CO material shows a high degree of correlation for TT Cyg and U Ant but a few distinct differences with other observables are also found.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201014633