K. Koyama, H. Kunieda, Y. Takeuchi, and Y. Tawara

Abstract

A 111-sec-period X-ray pulsation from Sct X-1 is reported. The pulse profile was found to exhibit double peaks. The x-ray spectrum of Sct X-1 is fitted by a single power-law function with a photon index of about 1.9. Evidence for extremely large absorption (greater than 10 to the 23rd H/sq cm) has been found in the low-energy band and near the iron K-edge. When combined with the previous observations, these data show that the X-ray flux has been variable over more than two orders of magnitude.