Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-17
Astron.Lett. 27 (2001) 790-793
Astronomy and Astrophysics
Astrophysics
7 pages, 2 figures, To be published in Astronomy Letters, Vol. 27, No. 12, 2001, pp. 790-793 (English version by "MAIK Nauka")
Scientific paper
10.1134/1.1424361
We present results of RXTE observations of the X-ray source Cyg X-2 during 1996-1999. Its power density spectra in the 0.1-128-Hz band are fitted by a model that takes into account the power-law spectral behavior at frequencies below and above the break frequency, with an introduction of one or more Lorenz lines to describe the peaks of quasi-periodic oscillations that correspond to the horizontal branch of the Z track. The RXTE observations have revealed a positive correlation between the break frequency and the indices of the two parts of the spectrum. The spectrum steepens with increasing break frequency both above and below the break frequency.
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