Quasi-periodic X-ray oscillations in the source Cygnus X-2 |
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Authors: | S. I. Kuznetsov |
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Affiliation: | (1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia;(2) Service d’Astrophysique, Centre d’Etudes Nucleaires de Saclay, 91191 Gif-sur-Yvette Cedex, France |
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Abstract: | The RXTE observations of Cyg X-2 during 1996–1999 are presented. The properties of quasi-periodic oscillations (QPOs) are analyzed in detail. A new method of averaging the power-density spectra obtained during various observations is used to search for kHz QPOs. Its distinctive feature is the grouping of observations not only by spectral characteristics of the source’s X-ray radiation but also by its temporal characteristics. The results obtained are used for an analysis in terms of the transition-layer model (TLM) and the relativistic-precession model (RPM) for a slowly rotating neutron star. Theoretical predictions of the two models are compared, and their self-consistency is verified. The tilt of the magnetosphere to the accretion-disk plane and the neutron-star mass and angular momentum are determined using these models. The distance to the source is estimated from observational data. |
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Keywords: | neutron stars Cygnus X-2 X-ray sources quasi-periodic oscillations |
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