Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1054..117t&link_type=abstract
COOL DISCS, HOT FLOWS: The Varying Faces of Accreting Compact Objects. AIP Conference Proceedings, Volume 1054, pp. 117-122 (20
Other
X-Ray Binaries, Black Holes, Neutron Stars, Accretion And Accretion Disks, Helioseismology, Pulsations, And Shock Waves, Galaxy Clusters, Astronomical Observations
Scientific paper
Quasiperiodic oscillations (QPOs) are observed in various neutron star (NS) and black hole (BH) X-ray binaries. Special kind of QPOs corresponds to kilohertz frequency range. These kHz QPOs attract a large part of astrophysical community due to a possible link to an orbital motion in a strong gravity close to the binary central compact object. In BH case frequencies of observed kHz QPO modulation remains usually constant for a given source. When more distinct kHz frequencies are measured within a given BH source, they appear in ratios of small natural numbers, typically in a 3:2 ratio. On the other hand, frequencies of NS kHz QPOs varies in individual sources even on scales of hundreds Hertz. It has been discussed in a serie of papers whether the 3:2 (and other) ratios pop up also in these variable frequencies of NS systems or not. Here we present a brief overview of the ``3:2 subject'' and summarize several recent findings of different autors which partially resolve this question. Finally, we specify some consequences for orbital QPO models.
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