X-ray emission from hot hydrogen-deficient white dwarfs.

Details X-ray emission from hot hydrogen-deficient white dwarfs. X-ray emission from hot hydrogen-deficient white dwarfs.

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..205w&link_type=abstract

International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 205 - 206

Astronomy and Astrophysics

Astrophysics

White Dwarfs: Stellar Coronae, White Dwarfs: X Rays

Scientific paper

The ROSAT observatory has detected X-rays from a small number of hot hydrogen-deficient (pre-) white dwarfs. These PG 1159-035 stars and helium-rich white dwarfs are hot enough (Teff ≥ 100 kK) to emit thermal X-rays from their photospheres. The author summarizes the results of non-LTE model atmosphere analyses. One remarkable result is the discovery of two previously unknown and peculiar PG 1159 stars. In a combined analysis with ultraviolet spectroscopic data obtained with the Hubble Space Telescope one of these objects turns out to be the hottest known PG 1159 star. Another surprising result is the first detection of a corona about a white dwarf.

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