Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-08-14
Mon.Not.Roy.Astron.Soc. 328 (2001) 527
Astronomy and Astrophysics
Astrophysics
31 pages, 19 figures (some are gif files), MNRAS in press
Scientific paper
10.1046/j.1365-8711.2001.04887.x
The hydrogen-deficient carbon-rich [WCL] type central star HD167362 and its oxygen-rich planetary nebula (PN) SwSt~1 are investigated. The nebular chemistry might indicate a recent origin for the carbon-rich stellar spectrum. Its stellar and nebular properties might therefore provide further understanding of the origin of the [WCL] central star class. The UV-IR stellar spectra are modelled with state of the codes and show ~40kK central star with a wind and a C/O~3, indicative of efficient third dredge-up. The synthetic stellar flux distribution is used to model the high density, compact PN, which has a solar C/O ratio, is still enshrouded by 1200K and 230K dust shells and, reported here for the first time, in molecular hydrogen. Although it appears that the change in C/O ratio has been recent, the published spectroscopy since 1895 has been re-examined and no clear spectral change is seen. If an event occurred that has turned it into a hydrogen-deficient central star, it did not happen in the last 100 years.
Barlow Michael J.
Clayton Geoff C.
Crowther Paul A.
de Marco Orsola
deKoter A.
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