Orbital Period Changes of Cygnus X-3

Details Orbital Period Changes of Cygnus X-3 Orbital Period Changes of Cygnus X-3

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..233k&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.233-238.

Astronomy and Astrophysics

Astronomy

21

Stars: Individual (Cyg X-3), Stars: Mass Loss, X-Rays: Stars

Scientific paper

We describe the orbital period change of the X-ray binary Cygnus X-3, and present three new times of X-ray minima, obtained using the Ginga and ASCA satellites. Before 1990, the long-term ephemeris of Cyg X-3 required the introduction of a second time derivative, ddot {P}, of order -(1.27 +/- 0.19) times 10(-10) yr(-1) . This value indicates that the first time derivative, dot {P}, changes from a positive to a negative value around 1986. However, the new ASCA data points presented here do not confirm this large ddot {P} variation and indicate a significantly smaller ddot {P} of -(8.13 +/- 1.15) times 10(-11) yr(-1) and a global period change of dot {P}/P = (1.17 +/- 0.44) times 10(-6) yr(-1) . The derived dot {P} can be explained by a large mass-loss rate of 0.58 times 10(-6) M_T yr(-1) , where M_T is the total mass of the Cyg X-3 system. This value is consistent with the expected mass-loss rate of the Wolf-Rayet star of about 10(-6) MO yr(-1) . The existence of a red-noise type fluctuation is also described.

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