EUV photometry of DA white dwarfs with EXOSAT

Details EUV photometry of DA white dwarfs with EXOSAT EUV photometry of DA white dwarfs with EXOSAT

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..253j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 253-257.

Astronomy and Astrophysics

Astronomy

46

Exosat Satellite, Extreme Ultraviolet Radiation, Stellar Spectrophotometry, Ultraviolet Photometry, White Dwarf Stars, Abundance, Helium, Hydrogen, Stellar Atmospheres, Stellar Evolution, Ultraviolet Astronomy

Scientific paper

The authors present EXOSAT EUV observations for 9 white dwarfs of spectral type DA. These are analysed together with other observational data from the literature using theoretical model atmospheres. For 8 objects He/H abundance ratios and interstellar hydrogen column densities are obtained. The data for HZ 43 seem to contradict recent results of other authors; possible explanations for the discrepancies are discussed. The results show that higher He/H ratios as well as a larger range of observed values are found in the hotter objects with Teff > 50,000K, whereas the cooler objects (Teff < 45,000K) have remarkably similar He/H ratios.

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