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On the Origin of the 21 Micron Feature in Post-AGB Stars

Published online by Cambridge University Press:  25 May 2016

Sun Kwok ,
Kevin Volk  and
Bruce J. Hrivnak
Sun Kwok
Affiliation:
Department of Physics & Astronomy, University of Calgary, Calgary, Canada
Kevin Volk
Affiliation:
Department of Physics & Astronomy, University of Calgary, Calgary, Canada
Bruce J. Hrivnak
Affiliation:
Department of Physics & Astronomy, Valparaiso University, Valparaiso, Indiana, USA

Abstract

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The unidentified emission feature at 21 μm is now observed in 12 sources, all being objects in transition between the asymptotic giant branch and planetary nebulae phases. The relations between the 21 μm and other emission features, such as the PAH features and the broad 30 μm feature, and the possible origins of the 21 μm feature are discussed.

Type
Part 3. Formation, Composition, and Processing of Dust
Information
Symposium - International Astronomical Union , Volume 191: Asymptotic Giant Branch Stars , 1999 , pp. 297 - 302
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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