Analysis of the ROSAT pointed observation of the hot DA white dwarf HS1234+4811

Details Analysis of the ROSAT pointed observation of the hot DA white dwarf HS1234+4811 Analysis of the ROSAT pointed observation of the hot DA white dwarf HS1234+4811

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..319j&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, P. (12)319-(12)322

Astronomy and Astrophysics

Astronomy

1

Abundance, Helium, Hydrogen, Stellar Atmospheres, Stellar Models, Ultraviolet Astronomy, White Dwarf Stars, X Ray Astronomy, Metallicity, Oxygen, Proportional Counters, Rosat Mission, Sky Surveys (Astronomy)

Scientific paper

The ROSAT data of the hot DA white dwarf HS1234+4811 were analyzed in the framework of three different assumptions for the structure of the white dwarf's atmosphere. It could be excluded that the star has a homogeneously mixed photosphere consisting of helium and hydrogen only, but from ROSAT observations alone it is not possible to decide if the object has a stratified atmosphere with an ultrathin hydrogen layer (MH approx. = 7 x 10-14 solar masses) on top of the He envelope or if heavier elements are responsible for the absorption in the soft X-ray region.

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