Abstract
We present a preliminary abundance analysis, utilising recombination theory, for the [WC] Wolf-Rayet central stars of the planetary nebulae NGC 6751 and NGC 6905. This analysis is based on optical spectrophotometry of a sample of [WC] stars which show a strong O VI 3811, 34 Å feature in emission. We have performed a recombination line analysis of stellar wind emission lines which are judged to be optically thin, in order to derive relative C, O and He abundances. We also present a comparison of the derived wind abundances with those of Population I WO stars. For the [WC 4] central star of NGC 6751, we have derived C/He = 0.35 and C/O = 4.2, by number. And for the [WC 3] central star of NGC 6905, we have derived C/He = 0.36 and C/O< 12. These surface abundances are comparable to the abundances that have been derived for early type [WC] stars via more complex NLTE modelling (e.g. Koesterke & Hamann 1996).
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© 1997 Springer Science+Business Media Dordrecht
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Kingsburgh, R.L., Dashevsky, I., Barlow, M.J. (1997). Recombination Line Abundances in the Winds of the [WC] Wolf-Rayet Stars. In: Habing, H.J., Lamers, H.J.G.L.M. (eds) Planetary Nebulae. International Astronimical Union / Union Astronomique Internationale, vol 180. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5244-0_36
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DOI: https://doi.org/10.1007/978-94-011-5244-0_36
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