Evidence for a 16.6 day period from Circinus X-1.
Abstract
Analysis of All-Sky Monitor observations of Cir X-1 (3U 1516-56) over the period from October 1975 to April 1976 has revealed a well-defined modulation of the 3-6-keV flux at a period of 16.585(+ or - 0.01) days. The light-curve is characterized by an abrupt drop in emission occurring on a time scale of no more than about 0.07 day, with epoch JD 2,442,877.181(+ or - 0.07). No clear correspondingly sharp increase in emission is observed during the cycle, so a noneclipse origin for this effect cannot be ruled out.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- September 1976
- DOI:
- 10.1086/182235
- Bibcode:
- 1976ApJ...208L..71K
- Keywords:
-
- All Sky Photography;
- Eclipsing Binary Stars;
- Orbital Elements;
- X Ray Sources;
- Light Curve;
- Satellite-Borne Photography;
- Time Response;
- Astronomy