Discovery of a nonsolar extreme-ultraviolet source

Details Discovery of a nonsolar extreme-ultraviolet source Discovery of a nonsolar extreme-ultraviolet source

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...203l..71l&link_type=abstract

Astrophysical Journal, vol. 203, Jan. 15, 1976, pt. 2, p. L71-L74.

Astronomy and Astrophysics

Astrophysics

83

Far Ultraviolet Radiation, Radiation Sources, Stellar Spectrophotometry, X Ray Sources, Apollo Soyuz Test Project, Apollo Telescope Mount, Black Body Radiation, Extraterrestrial Radiation, Grazing Incidence Telescopes, Spectral Energy Distribution, White Dwarf Stars

Scientific paper

Results are reported for observations of EUV emission from an extrasolar object which were made with a grazing-incidence telescope during the Apollo-Soyuz mission. The total energy flux in the spectral band between 170 and 620 A is estimated to be approximately 4 by 10 to the -9th power erg/sq cm per sec. It is shown that the data support the identification of the EUV object with the ultrasoft X-ray source in Coma Berenices. The source of both emissions is suggested to be the hot white dwarf HZ 43, located at right ascension 13 hr 43 min and declination +29 deg 22 min (1950). The temperature of HZ 43 is estimated as 110,000 K, giving it the highest temperature of any known white dwarf.

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