Water Ice, Silicate, and Polycyclic Aromatic Hydrocarbon Emission Featuresin the Infrared Space Observatory Spectrum of the Carbon-richPlanetary Nebula CPD –56°8032*

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Published 1999 February 28 • © 1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.
, , Citation Martin Cohen et al 1999 ApJ 513 L135 DOI 10.1086/311914

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Author affiliations

1 Radio Astronomy Laboratory, 601 Campbell Hall, University of California, Berkeley, Berkeley, CA 94720

2 Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK

3 Institut d'Astrophysique Spatiale, Bâtiment 121, Université de Paris XI, F-91405 Orsay Cedex, France

4 Space Science Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK

5 Laboratoire de Glaciologie et Géophysique de l'Environnement, CNRS, 54 rue Molière, BP 96, F-38041 Grenoble/Saint Martin d'Hères, France

Dates

  1. Received 1998 August 18
  2. Accepted 1999 January 7
  3. Published
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1538-4357/513/2/L135

Abstract

Combined Infrared Space Observatory Short-Wavelength Spectrometer and Long-Wavelength Spectrometer spectroscopy is presented of the late WC-type planetary nebula nucleus CPD -56°8032 and its carbon-rich nebula. The extremely broad coverage (2.4-197 μm) enables us to recognize the clear and simultaneous presence of emission features from both oxygen- and carbon-rich circumstellar materials. Removing a smooth continuum highlights bright emission bands characteristic of polycyclic aromatic hydrocarbons in the 3-14 μm region, bands from crystalline silicates longward of 18 μm, and the 43 and 62 μm bands of crystalline water ice. We discuss the probable evolutionary state and history of this unusual object in terms of (a) a recent transition from an O-rich to a C-rich outflow following a helium shell flash or (b) a carbon-rich nebular outflow encountering an O-rich comet cloud.

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Footnotes

  • * 

    Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands, and the United Kingdom) with the participation of ISAS and NASA.

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10.1086/311914