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Far-Infrared Atomic Lines: PDRs or Shocks?

Published online by Cambridge University Press:  26 May 2016

Margaret Meixner ,
David Fong ,
Edmund C. Sutton ,
Arancha Castro-Carrizo ,
Valentín Bujarrabal ,
William B. Latter ,
Alexander Tielens ,
Douglas M. Kelly  and
Michael J. Barlow
Margaret Meixner
Affiliation:
University of Illinois, Dept. of Astronomy, MC-221, Urbana, IL 61801
David Fong
Affiliation:
University of Illinois, Dept. of Astronomy, MC-221, Urbana, IL 61801
Edmund C. Sutton
Affiliation:
University of Illinois, Dept. of Astronomy, MC-221, Urbana, IL 61801
Arancha Castro-Carrizo
Affiliation:
Observatorio Astronómico Nacional, Apartado 1143, E-28800, Alcalá de Henares, Spain
Valentín Bujarrabal
Affiliation:
Observatorio Astronómico Nacional, Apartado 1143, E-28800, Alcalá de Henares, Spain
William B. Latter
Affiliation:
Caltech, SIRTF Science Center, MS 314-6, Pasadena, CA 91125
Alexander Tielens
Affiliation:
Kapteyn Astronomical Inst. Postbus, 800, Groningen, 9700 Netherlands
Douglas M. Kelly
Affiliation:
Univ. of Arizona, Steward Obs., Tucson, AZ, 85721
Michael J. Barlow
Affiliation:
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom

Extract

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The relative role of the stellar radiation field, the stellar outflows and the interstellar radiation field (ISRF) in transforming the molecular ejecta into atomic gas was the subject of our ISO LWS and SWS spectroscopy study of 24 evolved stars which span the range from AGB stars to proto-planetary nebulae (PPNs) and PNs. The far-infrared (FIR) atomic fine-structure lines are powerful probes of the warm atomic gas in photodissociation regions (PDRs) and shocks. This paper summarizes and compares the ISO spectroscopy studies of carbon-rich (C-rich) and oxygen-rich (O-rich) evolved stars, published by Fong et al. (2001) and Castro-Carrizo et al. (2001), respectively. We find that photodissociation, not shocks, is responsible for the chemical change from molecular to atomic gas.

Type
Part VI: The Ionized Gas in Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 349 - 352
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

Castro-Carrizo, A., Bujarrabal, V., Fong, D., Meixner, M., Tielens, A.G.G.M., Latter, W.B. & Barlow, M.J. 2001, A&A, 367, 674 Google Scholar
Fong, D., Meixner, M., Castro-Carrizo, A., Bujarrabal, V., Latter, W.B., Tielens, A.G.G.M., Kelly, D.M., & Sutton, E.C. 2001, A&A, 367, 652 Google Scholar