Hostname: page-component-7bb8b95d7b-w7rtg Total loading time: 0 Render date: 2024-09-12T08:24:52.842Z Has data issue: false hasContentIssue false

An empirical analysis of the stellar wind and Planetary Nebulae of the [WC10] central stars CPD–56° 8032 and He 2–113

Published online by Cambridge University Press:  25 May 2016

Orsola de Marco
Affiliation:
Dept. of Physics and Astronomy, University College London, Gower Str., London WC1E 6BT, UK
M. J. Barlow
Affiliation:
Dept. of Physics and Astronomy, University College London, Gower Str., London WC1E 6BT, UK
P. J. Storey
Affiliation:
Dept. of Physics and Astronomy, University College London, Gower Str., London WC1E 6BT, UK

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

[WC] stars are H–deficient central stars of PN which have developed a dense, fast stellar wind. Their spectra can mimic the spectra of massive (Min∼5OM⊙) Wolf-Rayet stars of the carbon sequence. Deriving their parameters is of importance both in understanding the PN and the Wolf-Rayet phenomena. Spectra of both objects were obtained at the AAT in May 1993 with the UCL Echelle Spectrograph (3500–9200 å, R=50,0000). The reddening, determined from comparing the Hβ nebular line fluxes with radio fluxes from Purton et al. (MNRAS 128, 321, 1982), yielded E(B-V)=0.68 (CPD–56° 8032) and 1.00 (He 2–113). Distances are derived using two different methods and they agree within the relative uncertainties. They are 1.35 and 1.50 kpc for CPD–56° 8032 and He 2–113, respectively. The electron temperatures of the C ii line formation region in the wind is derived from a recombination line analysis (20,000 and 17,000 K for CPD–56° 8032 and He 2–113, respectively). From the same stellar wind recombination line analysis, we find C/He=0.12 and 0.16, together with O/He=0.19 and 0.25, for CPD–56° 8032 and He 2–113 respectively.

Type
III. Central Stars
Copyright
Copyright © Kluwer 1997