An intense extreme-ultraviolet source in Cetus

Details An intense extreme-ultraviolet source in Cetus An intense extreme-ultraviolet source in Cetus

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210l..79m&link_type=abstract

Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 2, p. L79-L82.

Astronomy and Astrophysics

Astrophysics

65

Binary Stars, Far Ultraviolet Radiation, Hot Stars, Stellar Luminosity, Stellar Temperature, White Dwarf Stars, Apollo Soyuz Test Project, Interstellar Gas, Stellar Radiation, Stellar Spectra, Stellar Spectrophotometry

Scientific paper

The detection of a second EUV (100-1000 A) probable white dwarf star with the EUV telescope aboard the Apollo Soyuz mission is reported. The positional error box includes Feige 24, a binary system consisting of a very blue white dwarf and a dMe star. A grid of LTE pure-hydrogen, high-surface-gravity model atmospheres, is used, in combination with the EUV data and optical spectrophotometry, to derive the stellar parameters, yielding an effective temperature of 60,000 K, a radius of 17,000 km at 100 pc, and a luminosity of 7(d/100 pc) squared solar luminosities. The Feige 24 models appear to rule out white dwarfs with pure hydrogen atmospheres if the interstellar helium abundance and ionization are not anomalous.

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