The dual dust chemistries of planetary nebulae with [WCL] central stars |
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| Authors: | Martin Cohen M. J. Barlow X.-W. Liu A. F. Jones |
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| Affiliation: | Radio Astronomy Laboratory, University of California, Berkeley, CA 94720, USA,; Department of Physics &Astronomy, University College London, Gower Street, London WC1E 6BT and; Carter Observatory, 40 Salamanca Road, Kelburn, PO Box 2909, Wellington, New Zealand |
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| Abstract: | The rather rare class of central stars of planetary nebulae that show very low-excitation Wolf–Rayet spectra has been a subject of great interest, particularly in the infrared, since its discovery in the late 1960s. Further peculiarities have been found with the advent of infrared spectroscopy from ISO . Notably, these objects simultaneously betray the presence of regions of carbon-rich and oxygen-rich dust chemistry. We compare and contrast complete ISO spectra between 2 and 200 μm of a sample of six [WC8] to [WC11] central stars, finding many similarities. Among this sample, one star provides strong evidence of quasi-periodic light variations, suggestive of a dust cloud orbiting in a plane from which we view the system. |
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| Keywords: | astrochemistry stars: chemically peculiar circumstellar matter stars: evolution stars: Wolf–Rayet planetary nebulae: general |
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