Energy spectrum and time variation of Sco X-1

Rao, U. R. ; Jayanthi, U. B. ; Prakasarao, A. S. (1969) Energy spectrum and time variation of Sco X-1 The Astrophysical Journal, 157 (2). L133-L137. ISSN 0004-637X

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Two rocket flights carrying X-ray payloads were conducted from Thumba Equatorial Rocket Launching Station (TERLS), Trivandrum, India, on November 3, 1968, and November 7, 1968, respectively. The energy spectrum of the Sco X-1 X-ray source observed during both flights in the energy range 2-20 keY is presented. A comparison of our results with the previous observations indicates that the flux of Sco X-1 exponentially decreased over the period 1965-1968 with a time constant of about 4.1 years.

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