Extreme Ultraviolet Observations of White Dwarfs

  • Michael Lampton
  • Bruce Margon
  • Stuart Bowyer
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUH, volume 4-2)


Observations shortward of the hydrogen Lyman limit provide sensitive determinations of stellar temperatures and interstellar absorption. Such data are of particular value in studies of hot white dwarfs, for which a large fraction of the emission occurs in the extreme ultraviolet band (100–1000 Å). Observations of HZ 43 and Feige 24 have been obtained with the Apollo-Soyuz extreme ultraviolet telescope; both stars are copious EUV emitters, with 4 × 10-9 and 3 × 10-9 erg/cm2 sec in the 170–620 Å band respectively. The EUV data combined with optical spectrophotometry, allow their temperatures to be estimated as 80,000 and 60,000 K respectively. The corresponding interstellar neutral hydrogen column densities are ~ 4 × 1018 cm-2.


White Dwarf Spectral Energy Distribution High Gravity Channel Electron Multiplier Barium Fluoride 
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Copyright information

© IAU 1977

Authors and Affiliations

  • Michael Lampton
    • 1
  • Bruce Margon
    • 1
  • Stuart Bowyer
    • 1
  1. 1.Space Sciences LaboratoryUniversity of CaliforniaBerkeleyUSA

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