2008
On the origin of clustering of frequency ratios in the atoll source 4U~1636-53
ABRAMOWICZ, Marek; Pavel BAKALA; Zdeněk STUCHLÍK and Gabriel TÖRÖKBasic information
Original name
On the origin of clustering of frequency ratios in the atoll source 4U~1636-53
Authors
Edition
Acta Astronomica, PL - Polská republika, 2008, 0001-5237
Other information
Language
English
Type of outcome
Article in a journal
Field of Study
10308 Astronomy
Confidentiality degree
is not subject to a state or trade secret
Impact factor
Impact factor: 1.778
Organization unit
Faculty of Philosophy and Science in Opava
UT WoS
000258131600004
EID Scopus
2-s2.0-49449112083
Keywords in English
X-rays:binaries, neutron stars, Accretion, accretion disks
Tags
Tags
International impact, Reviewed
Links
LC06014, research and development project. MSM4781305903, plan (intention).
Changed: 14/12/2020 10:15, Mgr. Pavlína Jalůvková
Abstract
In the original language
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