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@article{42088, author = {Abramowicz, Marek and Bakala, Pavel and Stuchlík, Zdeněk and Török, Gabriel}, article_location = {PL - Polská republika}, article_number = {0}, keywords = {X-rays:binaries, neutron stars, Accretion, accretion disks}, language = {eng}, issn = {0001-5237}, journal = {Acta Astronomica}, title = {On the origin of clustering of frequency ratios in the atoll source 4U~1636-53}, volume = {58}, year = {2008} }
TY - JOUR ID - 42088 AU - Abramowicz, Marek - Bakala, Pavel - Stuchlík, Zdeněk - Török, Gabriel PY - 2008 TI - On the origin of clustering of frequency ratios in the atoll source 4U~1636-53 JF - Acta Astronomica VL - 58 SP - 113-119 EP - 113-119 SN - 00015237 KW - X-rays:binaries, neutron stars, Accretion, accretion disks N2 - A long discussion has been devoted to the issue of clustering of the kHz QPO frequency ratios in the neutron star sources. While the distribution of ratios inferred from an occurrence of a single QPO seems to be consistent with a random walk, the distribution based on simultaneous detections of both peaks indicates a preference of ratios of small integers. Based on the public RXTE data we further investigate this issue for the source 4U1636. Quality factors and rms amplitudes of both the QPOs nearly equal to the points where the frequencies are commensurable, and where the twin QPO detections cluster. We discuss a connection of the clustering with the varying properties of the two QPO modes. We obtain results which are in qualitative agreement with theobserved distributions ER -
ABRAMOWICZ, Marek, Pavel BAKALA, Zdeněk STUCHLÍK and Gabriel TÖRÖK. On the origin of clustering of frequency ratios in the atoll source 4U~1636-53. \textit{Acta Astronomica}. PL - Polská republika, 2008, vol.~58, p.~113-119. ISSN~0001-5237.
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