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Title:
Evidence for a 16.6 day period from Circinus X-1
Authors:
Kaluzienski, L. J.; Holt, S. S.; Boldt, E. A.; Serlemitsos, P. J.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt; Maryland, University, College Park, Md.), AB(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AC(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.), AD(NASA, Goddard Space Flight Center, Laboratory for High Energy Astrophysics, Greenbelt, Md.)
Publication:
Astrophysical Journal, vol. 208, Sept. 1, 1976, pt. 2, p. L71-L75. (ApJL Homepage)
Publication Date:
09/1976
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
All Sky Photography, Eclipsing Binary Stars, Orbital Elements, X Ray Sources, Light Curve, Satellite-Borne Photography, Time Response
DOI:
10.1086/182235
Bibliographic Code:
1976ApJ...208L..71K

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.

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