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Low-Excitation Atomic Gas in PPNe: Iso Observations of Fir line Emission in O-Rich Objects

Castro-Carrizo, Arancha and Bujarrabal, Valentín and Fong, Dave and Meixner, Margaret and Tielens, Alexander G. G. M. and Latter, William B. and Barlow, Michael J. (2001) Low-Excitation Atomic Gas in PPNe: Iso Observations of Fir line Emission in O-Rich Objects. In: Post-AGB Objects as a Phase of Stellar Evolution. Astrophysics and Space Science Library. No.265. Springer , Dordrecht, pp. 409-412. ISBN 978-90-481-5758-7.

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We present ISO observations of fine-structure atomic lines in the far-infrared (FIR) from a sample of protoplanetary nebulae (PPNe). Only nebulae surrounding stars hotter than 10000 K were detected. We have compared our data with emission models of photodissociation regions (PDRs) and of shocked regions. The dependence of the emission on the stellar temperature, and the good agreement with the PDR models suggest that emission comes from PDRs instead of shocked regions. The [C II] 158 μm line intensity has been used to measure the mass of the low-excitation atomic gas.

Item Type:Book Section
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Additional Information:© 2001 Springer Science+Business Media Dordrecht.
Subject Keywords:Planetary Nebula; Shocked Region; Molecular Dissociation; Stellar Temperature; Protoplanetary Nebula
Series Name:Astrophysics and Space Science Library
Issue or Number:265
Record Number:CaltechAUTHORS:20191127-132257044
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100110
Deposited By: Tony Diaz
Deposited On:28 Nov 2019 02:08
Last Modified:16 Nov 2021 17:51

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