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@inproceedings{42062,
author = {Čermák, Petr and Stuchlík, Zdeněk and Török, Gabriel},
address = {Opava},
booktitle = {Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars},
keywords = {X rays, binaries, neutron stars, accretion discs},
language = {eng},
location = {Opava},
isbn = {978-80-7248-419-5},
pages = {511-522},
publisher = {Slezská univerzita v Opavě, Filozoficko-přírodovědecká fakulta, Ústav fyziky},
title = {Reverse of twin peak kHz QPO interrelationship in the six atoll sources},
year = {2007}
}
TY - JOUR
ID - 42062
AU - Čermák, Petr - Stuchlík, Zdeněk - Török, Gabriel
PY - 2007
TI - Reverse of twin peak kHz QPO interrelationship in the six atoll sources
PB - Slezská univerzita v Opavě, Filozoficko-přírodovědecká fakulta, Ústav fyziky
CY - Opava
SN - 9788072484195
KW - X rays, binaries, neutron stars, accretion discs
N2 - For six neutron star atoll sources spanning wide range of frequencies we investigate whether the relationship between the rms amplitudes and quality factors of the observed kHzQPO LU display features that could have a significant meaning in terms of theproposed QPO models.We find for all the six sources that after the twin kHz QPOs pass a point (or the narrow interval) where their ratio R equals 1:5 the lower/upper oscillation becomes stronger/weakerthan other one with increasing QPO frequency. Existence of a similar effect close to R D 1:33 or R D 1:25 is also indicated. This interval lies between frequencies corresponding to 3=2 and 4=3 (or 5=4) frequency ratio. This finding implies restrictions to the orbital QPO models (both hot spot- and disc oscillations- like) and also to QPO modulation mechanism. In a wider context, our results may indicate the existence of an energy over flow between the upper and lower QPO mode when their ratio is close to ratio of small integral numbers.
ER -
ČERMÁK, Petr, Zdeněk STUCHLÍK a Gabriel TÖRÖK. Reverse of twin peak kHz QPO interrelationship in the six atoll sources. In \textit{Proceedings of RAGtime 8/9: Workshops on black holes and neutron stars}. Opava: Slezská univerzita v Opavě, Filozoficko-přírodovědecká fakulta, Ústav fyziky, 2007, s.~511-522, 11 s. ISBN~978-80-7248-419-5.
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