EDP Sciences
Free access
Volume 420, Number 2, June III 2004
Page(s) 665 - 671
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20040110

A&A 420, 665-671 (2004)
DOI: 10.1051/0004-6361:20040110

Binary corrected X-ray light curve of Cygnus X-3: Implications for the timing properties of the compact binary system

M. Choudhury1, A. R. Rao1, S. V. Vadawale1, A. K. Jain2 and N. S. Singh3

1  Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai-400005, India
2  ISRO Satellite Centre, Bangalore-560017, India
3  Dept. of Physics, Manipur University, Canchipur, Imphal, Manipur-795003, India

(Received 5 May 2003 / Accepted 9 March 2004)

We study the binary corrected X-ray light curve of Cygnus X-3 using the RXTE-ASM (All Sky Monitor) data and RXTE-PCA data. We find that the X-ray template derived from the EXOSAT observations adequately explains the binary variations. Using the recently determined quadratic binary ephemeris we correct the RXTE-PCA lightcurve and obtain the power spectrum which shows distinct features of shifting towards the low frequency regime vis-a-vis the Galactic X-ray binaries. The power spectrum doesn't vary from the hard to the soft state. We also obtain the binary corrected RXTE-ASM monitoring lightcurve and examine the previously obtained correlation between soft X-ray (2-12 keV from RXTE ASM), hard X-ray (20-100 keV from CGRO-BATSE) and radio (2.2 GHz from GBI) after the binary correction. We find that the correlation time scale is less than a day.

Key words: accretion, accretion disks -- stars: binaries: close -- stars: individual: Cygnus X-3 -- radio continuum: stars -- X-rays: binaries

Offprint request: M. Choudhury, manojulu@tifr.res.in

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