Abstract
The ROSAT mission has provided EUV and X-ray data for a large sample of DA white dwarfs with which we can study their photospheric composition and structure through the effect of opacity sources on the emergent fluxes. Contrary to expectations little (if any) helium is found and the main sources of opacity appear to be trace heavy elements. However, photometric data do not allow us to determine the abundance of the individual elements and observations with the EUVE spectrometers will be essential for detailed composition measurements.
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© 1993 Springer Science+Business Media Dordrecht
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Barstow, M.A. et al. (1993). Photospheric Composition and Structure in DA White Dwarfs. In: Barstow, M.A. (eds) White Dwarfs: Advances in Observation and Theory. NATO ASI Series, vol 403. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2020-3_20
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DOI: https://doi.org/10.1007/978-94-011-2020-3_20
Publisher Name: Springer, Dordrecht
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