Evidence for a 16.6 day period from Circinus X-1

Details Evidence for a 16.6 day period from Circinus X-1 Evidence for a 16.6 day period from Circinus X-1

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...208l..71k&link_type=abstract

Astrophysical Journal, vol. 208, Sept. 1, 1976, pt. 2, p. L71-L75.

Astronomy and Astrophysics

Astrophysics

79

All Sky Photography, Eclipsing Binary Stars, Orbital Elements, X Ray Sources, Light Curve, Satellite-Borne Photography, Time Response

Scientific paper

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.

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