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- W3103184424 abstract "We present a spectral analysis of the sdO central star K 648 based on medium-resolution optical and high-resolution UV spectra. The photospheric parameters are determined by means of state-of-the-art NLTE model atmosphere techniques. We found and . The helium () and oxygen () abundances are about solar while carbon is enriched by a factor of 2.5 (). Nitrogen (, ) appears at a sub-solar value. However, these metal abundances are much higher than the cluster's metallicity (M 15: ). The surface composition appears to be a mixture of the original hydrogen-rich material and products of helium burning ( process) which have been mixed up to the surface. The abundances of He, C, and N are consistent with the nebular abundance, while O is considerably more abundant in the photosphere than in the nebula. From a comparison of its position in the – plane with evolutionary calculations a mass of and a luminosity of are deduced. Our spectroscopic distance is in agreement with the distance of M 15 as determined by Alves et al. (2000). From the GHRS spectra we measure a radial velocity of ." @default.
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- W3103184424 date "2002-01-01" @default.
- W3103184424 modified "2023-09-27" @default.
- W3103184424 title "Spectral analysis of the sdO K 648, the exciting star of the planetary nebula Ps 1 in the globular cluster M 15 (NGC 7078)" @default.
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- W3103184424 doi "https://doi.org/10.1051/0004-6361:20011535" @default.
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