The discovery of low-energy X-ray emission from U Geminorum

Details The discovery of low-energy X-ray emission from U Geminorum The discovery of low-energy X-ray emission from U Geminorum

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l.129m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Dec. 15, 1978, p. L129-L132.

Astronomy and Astrophysics

Astronomy

46

Binary Stars, Novae, Satellite Observation, White Dwarf Stars, X Ray Sources, Heao 1, Spectral Energy Distribution, Ultraviolet Astronomy

Scientific paper

Strong X-ray emission in the 0.15-0.5-keV band has been detected from U Gem during optical outburst. The peak flux observed in the 0.15-0.5-keV range is 3.2 x 10 to the -10th erg/sq cm per sec (about 3 x 10 to the 32nd erg/sec at 100 pc). No soft X-ray emission was detected during the quiescent optical phase at a level which is at least 100 times less than the peak outburst flux. During outburst, the soft X-ray source appears to be highly variable on a time scale of a few hours, but this variability is consistent with orbital dependence for the limited data sample available. The origin of the soft X-ray emission is discussed.

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