All-Moscow Seminar of Astrophysicists
(ASA)
The seminar is supported by the grant of Federal Programm "Integration"
annotation of talk
Lev G. Titarchuk
Nature of QPO in X-ray Binaries and ways of determination of theirs
physical characteristics
The precise measurements of kilohertz QPO frequencies reject bit-frequency
model as possible explanation of kilohertz oscillation spleating, which
now have observed on more than 20 binaries. The two oscillators model
(it was proposed latterly by Titarchuk and Oshirovich) open possibility
for precise diagnostic of spectral and temporal properties of compact
objects (neutron stars and black holes).
New model explains the variation of difference between frequencies of
two kilphertz oscillations in assumptyon that upper frecuency is
upper hibrid frequency of Keplerian oscillator under Koriolis force action
and the lower observed frecuency is the Keplerian frecuency itself.
Such oscillatoh have two modes of oscillations: upper (about 1kHz) and
lower (about 50Hz). Last frequency sufficientlu depend from angle between
disk plane and equator of central object magritosphere.
In lower part of spectrum (at about 10Hz) this model identifies
radial viscous oscillations frequencies and fracuency of spectral cut-off,
which directly connected with diffusion processes in intermediate zone
(in inpernal part of accretion disk).
Most part of the current talk will give to verification of
correlation berween frequency properties of different oscillations.
Detalied QPO classification also will be presented.