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

Cohen, M; Barlow, MJ; Sylvester, RJ; Liu, XW; Cox, P; Lim, T; Schmitt, B; (1999) Water Ice, Silicate, and Polycyclic Aromatic Hydrocarbon Emission Featuresin the Infrared Space Observatory Spectrum of the Carbon-richPlanetary Nebula CPD –56°8032*. Astrophysical Journal Letters , 513 (2) L135-L138. 10.1086/311914. Green open access

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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.

Type: Article
Title: Water Ice, Silicate, and Polycyclic Aromatic Hydrocarbon Emission Featuresin the Infrared Space Observatory Spectrum of the Carbon-richPlanetary Nebula CPD –56°8032*
Open access status: An open access version is available from UCL Discovery
DOI: 10.1086/311914
Publisher version: https://doi.org/10.1086/311914
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, infrared : ISM : lines and bands, planetary nebulae : individual (CPD -56 degrees 8032), CENTRAL STARS CPD-56-DEGREES-8032, LONG-WAVELENGTH SPECTROMETER, RAYET STARS, DUST SHELLS, CALIBRATION, HE-2-113, OBJECTS, BANDS, WOLF, WC
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10095217
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