On the Origin of the 21 Micron Feature in Post-AGB Stars
Sun KwokDepartment of Physics & Astronomy, University of Calgary, Calgary, CanadaKevin VolkDepartment of Physics & Astronomy, University of Calgary, Calgary, CanadaBruce J. HrivnakDepartment of Physics & Astronomy, Valparaiso University, Valparaiso, Indiana, USA
1999en
ABI
Аннотация
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.
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