Wolf-Rayet stars of high and low mass
The quantitative analysis of Wolf-Rayet type spectra requires non-LTE models for expanding atmospheres which are available now. They were extensively applied to study the "classical", massive Wolf-Rayet stars of Population I. The obtained results are briefly reviewed and discussed. Wolf-Rayet type spectra are also shown by a subgroup of central stars of planetary nebulae. Recent spectral analyses of these low-mass stars yielded their parameters and atmospheric abundances, providing the empirical basis for discussing their evolutionary status. Hydrogen deficiency and strong mass-loss are the common features of both, high- and low-mass stars showing Wolf-Rayet type spectra.
In: Hydrogen-Deficient Stars. Proceedings of the 2nd International Colloquium held in Bamberg, Germany, September 1995, U. Heber and C.S. Jeffery (eds.), ASP Conference Series (in press)
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