SwSt 1: an O-rich planetary nebula around a C-rich central star

The hydrogen-deficient [WCL] type central star HD 167362 and its planetary nebula (PN) SwSt 1 are investigated. The central star has a carbon-rich emission-line spectrum, and yet the nebula exhibits a 10-μm emission feature from warm silicate dust, perhaps indicating a recent origin for the carbon-r...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2001-12, Vol.328 (2), p.527-554
Main Authors: De Marco, Orsola, Crowther, P. A., Barlow, M. J., Clayton, Geoffrey C., de Koter, A.
Format: Article
Language:English
Subjects:
planetary nebulae: individual: SwSt 1
stars: abundances
stars: AGB and post-AGB
stars: atmospheres
stars: evolution
stars: Wolf–Rayet
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Summary:The hydrogen-deficient [WCL] type central star HD 167362 and its planetary nebula (PN) SwSt 1 are investigated. The central star has a carbon-rich emission-line spectrum, and yet the nebula exhibits a 10-μm emission feature from warm silicate dust, perhaps indicating a recent origin for the carbon-rich stellar spectrum. Its stellar and nebular properties might therefore provide further understanding as to the origin of the [WCL] central star class. The central star optical and UV spectra are modelled with state-of-the art non-LTE codes for expanding atmospheres, from which the stellar parameters are determined. Using the Sobolev approximation code isa-Wind, we find , , (for a distance of 2.0 kpc), and . The abundance mass fractions for helium, carbon and oxygen are determined to be 37, 51 and 12 per cent, respectively. From this we derive (by mass), confirming that the star suffered efficient third dredge-up. The nitrogen abundance is close to zero, while an upper limit of
ISSN:0035-8711
1365-2966
DOI:10.1046/j.1365-8711.2001.04887.x