Hard X-rays from U Geminorum

Details Hard X-rays from U Geminorum Hard X-rays from U Geminorum

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l.133s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Dec. 15, 1978, p. L133-L136.

Astronomy and Astrophysics

Astrophysics

33

Binary Stars, Novae, Satellite Observation, White Dwarf Stars, X Ray Sources, Heao 1, Oso-8, Stellar Luminosity, Time Response

Scientific paper

The A-2 experiment on HEAO 1 has discovered that the dwarf nova U Geminorum can be a weak source of hard X-rays at optical maximum. During the outburst in October 1977, when a strong soft X-ray flux was discovered, a 2-10-keV flux was also observed. Evidence is presented that this flux appeared with the rise to optical maximum, about half a day before the soft X-rays appeared, and persisted about 2 days. During these first 2 days of the outburst the average flux was 2.4 x 10 to the -11th erg/sq cm per sec, corresponding to a luminosity of 2.8 x 10 to the 31st erg/s for a distance of 100 pc and an absorbed thin thermal spectrum with kT of about 5 keV. During optical minimum an OSO 8 upper limit implies a luminosity less than 10 to the 31st erg/s. Restrictions on models of U Geminorum are discussed.

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