Water Ice, Silicate and PAH Emission Features in the ISO Spectrum of the Carbon-rich Planetary Nebula CPD-56 8032

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dc.creatorCohen, Martin
dc.creatorBarlow, M. J.
dc.creatorSylvester, R. J.
dc.creatorLiu, X. -W.
dc.creatorCox, P.
dc.creatorLim, T.
dc.creatorSchmitt, B.
dc.creatorSpeck, A. K.
dc.date1999-01-11
dc.date.accessioned2026-07-07T02:29:56Z
dc.date.available2026-07-07T02:29:56Z
dc.descriptionCombined ISO SWS and LWS 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 microns) 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 (hereafter PAHs) in the 3-14 micron region, bands from crystalline silicates longwards of 18 microns, and the 43- and 62-micron 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.
dc.description15 pages, 3 Postscript figures
dc.identifierhttps://arxiv.org/abs/astro-ph/9901126
dc.identifierhttp://arxiv.org/abs/astro-ph/9901126
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13666
dc.subjectAstrophysics
dc.titleWater Ice, Silicate and PAH Emission Features in the ISO Spectrum of the Carbon-rich Planetary Nebula CPD-56 8032
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