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Extended Dust Shells Surrounding AGB Stars Revealed with ISO

Published online by Cambridge University Press:  25 May 2016

H. Izumiura  and
O. Hashimoto
H. Izumiura
Affiliation:
Okayama Astrophysical Observatory, NAOJ, Kamogata, Asakuchi, Okayama 719-0232, JAPAN
O. Hashimoto
Affiliation:
Gunma Astronomical Observatory 1-18-7 Ohotomo, Maebashi, Gunma 371-0847, JAPAN

Abstract

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We obtained high resolution far-infrared images of the circumstellar dust shells of several AGB carbon stars using ISOPHOT on board the ISO. We used the C-100 and C-200 detector arrays in PHT32 oversampling mode at 90 μm and 160 μm except for U Ant, which was observed at 60 μm and 90 μm. AFGL 3068 is very compact in both bands. R Scl is marginally resolved at 90 μm. U Ant shows a double shell structure, a compact but well resolved shell surrounded by a very extended envelope. Y CVn exhibits a very extended, hollow dust shell. We analyse the structure of the dust shells using a simple dust shell model and discuss the mass-loss behaviors, particularly in conjunction with the thermal pulses on the AGB.

Type
Part 4. Circumstellar Envelopes
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 401 - 406
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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