On the Origin of Clustering of Frequency Ratios in the Atoll Source 4U 1636-53

• Autorzy: Török G. , Abramowicz M. A. , Bakala P. , Bursa M. , Horák J. , Rebusco P. , Stuchlík Z.
• Języki publikacji: EN

Abstrakty

EN

A long discussion has been devoted to the issue of clustering of the kHz quasi periodic oscillation (QPO) frequency ratios in 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 4U 1636-53. Quality factors and rms amplitudes of both the QPOs nearly equal at 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. Assuming approximate relations for the observed correlations of the QPO properties, we attempt to reproduce the frequency and ratio distributions using a simple model of a random-walk evolution along the observed frequency-frequency correlation. We obtain results which are in qualitative agreement with the observed distributions.

Słowa kluczowe

EN

X-rays: binaries; Stars: neutron; Accretion; accretion disks

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2008
• Tom: Vol. 58, No. 2
• Strony: 113--119
• Opis fizyczny: Bibliogr. 31 poz., wykr.

Twórcy

autor

Török G.

• Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, 746-01 Opava, Czech Republic

autor

Abramowicz M. A.

• Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, 746-01 Opava, Czech Republic
• Department of Physics, Göteborg University, S-41296 Göteborg, Sweden
• Copernicus Astronomical Centre PAN, Bartycka 18, 00-716 Warsaw, Poland

autor

Bakala P.

• Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, 746-01 Opava, Czech Republic

autor

Bursa M.

• Astronomical Institute of the Academy of Sciences, Boční II 1401/1a, 141-31 Praha 4, Czech Republic

autor

Horák J.

• Astronomical Institute of the Academy of Sciences, Boční II 1401/1a, 141-31 Praha 4, Czech Republic

autor

Rebusco P.

autor

Stuchlík Z.

• Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezručovo nám. 13, 746-01 Opava, Czech Republic

Bibliografia

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