Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216l..71s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 216, Sept. 1, 1977, p. L71-L74.
Astronomy and Astrophysics
Astronomy
51
Binary Stars, Novae, Satellite Observation, White Dwarf Stars, X Ray Sources, Bremsstrahlung, Ground Stations, Optical Measurement, Oso-8, Spaceborne Astronomy, Stellar Mass Accretion
Scientific paper
Results are reported for hard X-ray observations of the binary system AM Her, which were coincident with soft X-ray and ground-based optical measurements. In the 2-60-keV band, variability was detected with an eclipse during phases 0.5 to 0.7 with respect to the 0.12892-day optical minima, synchronous with the known soft X-ray eclipse. The 2-60-keV uneclipsed flux was 9.5 by 10 to the -10th power erg/sq cm per sec, of which 86% lies above 10 keV. Thus, AM Her contains a hard source located near the similarly eclipsed soft X-ray source. The X-ray data are interpreted in terms of thermal bremsstrahlung from accretion onto a white dwarf.
Boldt Elihu
Holt Stephen S.
Lampton Michael
Serlemitsos Peter
Swank Jean
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