Showing papers by "R. P. Kudritzki published in 1993"
Journal Article•
TL;DR: In this article, the authors obtained a high quality ROSAT PSPC spectrum of the bright O4 f star ζ Pup and matched the observed X-ray spectrum (0.1 to 2.5 keV) under the assumption that the X-rays arise from shocks distributed throughout the wind.
Abstract: We have obtained a high quality ROSAT PSPC spectrum of the bright O4 f star ζ Pup. Allowing for the wind X-ray opacity, as computed from detailed non-LTE stellar wind models of ζ Pup, and under the assumption that the X-rays arise from shocks distributed throughout the wind, we have been able to match the observed X-ray spectrum (0.1 to 2.5 keV). The best model fit is obtained when He ++ recombines to He + in the outer regions of the stellar wind, as predicted by recent detailed cool wind model calculations. With a single temperature plasma, the best model fit indicates a temperature of log T s (K)=6.5 to 6.6 corresponding to shock velocities of around 500 km s −1
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