The Astrophysical Journal · 1979 · 12 citations · 0 references
Natural SciencesAstronomyPhysicsAstrophysicsObservational AstronomyX-ray AstronomyExtragalactic X-ray SourcesX-ray DetectorsField Of ViewHard X-ray BackgroundSpectral Flux DensityStellar X-ray RadiationX-ray Background IntensityX-ray Emission From Active StarsX-ray Source StabilityX-ray Variability Amplitude
Two observations of X Per performed on two successive days during the 1976 transatlantic balloon flight show a variation by a factor of 2.6 in the hard X-ray flux of the source. During both observations, corresponding to the transit in the detector field-of-view, the intensity was apparently stable. Comparison with OSO 7 results suggests that the source stays mainly in the state of lower flux.