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dc.contributor.authorErkut, M. Hakan
dc.contributor.authorPsaltis, Dimitrios
dc.contributor.authorAlpar, M. Ali
dc.date.accessioned2016-04-25T08:41:13Z
dc.date.available2016-04-25T08:41:13Z
dc.date.issued2008-11-10
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/11413/1149
dc.description.abstractThe observational characteristics of quasi-periodic oscillations (QPOs) from accreting neutron stars strongly indicate the oscillatory modes in the innermost regions of accretion disks as a likely source of the QPOs. The inner regions of accretion disks around neutron stars can harbor very high frequency modes related to the radial epicyclic frequency kappa. The degeneracy of kappa with the orbital frequency Omega is removed in a non-Keplerian boundary or transition zone near the magnetopause between the disk and the compact object. We show, by analyzing the global hydrodynamic modes of long wavelength in the boundary layers of viscous accretion disks, that the fastest growing mode frequencies are associated with frequency bands around kappa and kappa +/- Omega. The maximum growth rates are achieved near the radius where the orbital frequency Omega is maximum. The global hydrodynamic parameters such as the surface density profile and the radial drift velocity determine which modes of free oscillations will grow at a given particular radius in the boundary layer. In accordance with the peak separation between kHz QPOs observed in neutron star sources, the difference frequency between two consecutive bands of the fastest growing modes is always related to the spin frequency of the neutron star. This is a natural outcome of the boundary condition imposed by the rotating magnetosphere on the boundary region of the inner disk.tr_TR
dc.language.isoen_UStr_TR
dc.publisherIOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLANDtr_TR
dc.relationASTROPHYSICAL JOURNALtr_TR
dc.subjectaccretiontr_TR
dc.subjectaccretion diskstr_TR
dc.subjectstars: neutrontr_TR
dc.subjectstars: oscillationstr_TR
dc.subjectX-rays: starstr_TR
dc.subjectx-ray binariestr_TR
dc.subjectfrequenciestr_TR
dc.subjectbüyümetr_TR
dc.subjecttoplanma diskleritr_TR
dc.subjectyıldız: nötrontr_TR
dc.subjectyıldız: salınımlartr_TR
dc.subjectX-ışınları: yıldıztr_TR
dc.subjectX-ışın çiftleritr_TR
dc.subjectfrekanslarıtr_TR
dc.titleQUASI-PERIODIC OSCILLATIONS AS GLOBAL HYDRODYNAMIC MODES IN THE BOUNDARY LAYERS OF VISCOUS ACCRETION DISKStr_TR
dc.typeArticletr_TR
dc.contributor.authorIDTR9290tr_TR
dc.contributor.authorIDTR14241tr_TR


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