Showing papers by "R. P. Kudritzki published in 1991"
Journal Article•
TL;DR: In this article, high resolution spectra of the B05 Ia supergiants κ Orionis, Sk-68°41 in the Large Magellanic Cloud (LMC) and Sk 159 in the Small Magellan Cloud (SMC) were analysed using non-LTE model atmosphere and line formation calculations.
Abstract: High resolution spectra of the B05 Ia supergiants κ Orionis, Sk-68°41 in the Large Magellanic Cloud (LMC) and Sk 159 in the Small Magellanic Cloud (SMC) are analysed using non-LTE model atmosphere and line formation calculations
6 citations
Journal Article•
TL;DR: In this article, the authors show that the emission lines of the central star of the bonafide planetary nebula He 2-99 are as broad as, or broader, than those of several Pop.I WC9 stars.
Abstract: There are at least two kinds of Wolf-Rayet stars: (1) the ordinary, massive, luminous Population I WR stars; (2) a subset of the central stars of planetary nebulae, showing WR spectra. Somehow the concept has evolved that the WC9 central stars of planetary nebulae have systematically weaker and narrower emission lines than their substantially more massive Pop. I counterparts. Our purpose is to show convincingly that the concept is wrong: the emission lines of the central star of the bonafide planetary nebula He 2-99 are as broad as, or broader (and stronger) than those of several Pop.I WC9 stars. Therefore, widths or strengths of emission lines cannot be used as a criterion to decide if a given WC9 star is a low-mass post-asymptotic-giant-branch (post-AGB) central star of a planetary nebula or a massive, Pop.I WC9 star
2 citations