SMC X-1
Abstract
R. Lucke, D. Yentis, H. Friedman, G. Fritz and S. Shulman, Naval Research Laboratory, have observed x-ray pulsations in SMC X-1 (3U 0115-73) similar to those found in Her X-1 and Cen X-3. The pulse period is 0.716 +/- 0.001 s, and the profile is double with a very strong interpulse. Pulsations were observed on 1973 Nov. 12d14h52m UT during an Aerobee rocket flight from Woomera and on 1975 July 20d18h50m UT with the Apollo x-ray instrument during the Apollo-Soyuz mission. In 1973, 40 s of data were obtained at binary phase 0.83 +/- 0.03, and in 1975, 190 s of data at phase 0.88 +/- 0.05. In the energy range 2-10 keV the pulsed fraction is about 30 percent in both observations, and the source is observed in the 1-2 keV range with a pulsed fraction of 5-10 percent.
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- December 1975
- Bibcode:
- 1975IAUC.2878....2L