Abstract
Simultaneous hard X-ray and optical observations of Sco X-1 were carried out on 1971 May 1 at Hyderabad, India, when Sco X-1 was optically bright. The X-ray intensity observed by balloon-borne counter telescopes increased in coincidence with optical enhancements, while the plasma temperature derived by fitting the X-ray spectrum in the energy range 20–40 keV to the thermal bremsstrahlung spectrum did not appreciably change over the whole period of observation.
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Matsuoka, M., Fujii, M., Miyamoto, S. et al. Time variations of hard X-rays from Sco X-1. Astrophys Space Sci 18, 472–490 (1972). https://doi.org/10.1007/BF00645411
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DOI: https://doi.org/10.1007/BF00645411