Dependence of the Frequency of the Kilohertz Quasi-periodic Oscillationson X-Ray Count Rate and Colors in 4U 1608–52
We present new results based on observations carried out with the Rossi X-ray Timing Explorer during the decay of an outburst of the low-mass X-ray binary (LMXB) and atoll source 4U 1608-52. Our results appear to resolve, at least in 4U 1608-52, one of the long-standing issues about the phenomenolog...
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Autores principales: | , , , , |
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Formato: | Articulo |
Lenguaje: | Inglés |
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1999
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/145974 |
Aporte de: |
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I19-R120-10915-145974 |
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dspace |
institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
collection |
SEDICI (UNLP) |
language |
Inglés |
topic |
Ciencias Astronómicas Accretion, accretion disks Stars: individual (4U 1608252) Stars: neutron X-rays: stars |
spellingShingle |
Ciencias Astronómicas Accretion, accretion disks Stars: individual (4U 1608252) Stars: neutron X-rays: stars Méndez, Mariano R. van der Klis, M. Ford, Eric C. Wijnands, Rudy van Paradijs, J. Dependence of the Frequency of the Kilohertz Quasi-periodic Oscillationson X-Ray Count Rate and Colors in 4U 1608–52 |
topic_facet |
Ciencias Astronómicas Accretion, accretion disks Stars: individual (4U 1608252) Stars: neutron X-rays: stars |
description |
We present new results based on observations carried out with the Rossi X-ray Timing Explorer during the decay of an outburst of the low-mass X-ray binary (LMXB) and atoll source 4U 1608-52. Our results appear to resolve, at least in 4U 1608-52, one of the long-standing issues about the phenomenology of the kilohertz quasi-periodic oscillations (kHz QPOs), namely the lack of a unique relation between the frequency of the kHz QPOs and the X-ray flux. We show that despite its complex dependence on the X-ray flux, the frequency of the kHz QPOs is monotonically related to the position of the source in the color-color diagram. Our findings strengthen the idea that, as in the case of Z sources, in the atoll sources the X-ray flux is not a good indicator of and that the observed changes in the frequency of the kHz QPOs in LMXBs are driven by changes in . These results raise some concern about the recently reported detection of the orbital frequency at the innermost stable orbit in 4U 1820-30. |
format |
Articulo Articulo |
author |
Méndez, Mariano R. van der Klis, M. Ford, Eric C. Wijnands, Rudy van Paradijs, J. |
author_facet |
Méndez, Mariano R. van der Klis, M. Ford, Eric C. Wijnands, Rudy van Paradijs, J. |
author_sort |
Méndez, Mariano R. |
title |
Dependence of the Frequency of the Kilohertz Quasi-periodic Oscillationson X-Ray Count Rate and Colors in 4U 1608–52 |
title_short |
Dependence of the Frequency of the Kilohertz Quasi-periodic Oscillationson X-Ray Count Rate and Colors in 4U 1608–52 |
title_full |
Dependence of the Frequency of the Kilohertz Quasi-periodic Oscillationson X-Ray Count Rate and Colors in 4U 1608–52 |
title_fullStr |
Dependence of the Frequency of the Kilohertz Quasi-periodic Oscillationson X-Ray Count Rate and Colors in 4U 1608–52 |
title_full_unstemmed |
Dependence of the Frequency of the Kilohertz Quasi-periodic Oscillationson X-Ray Count Rate and Colors in 4U 1608–52 |
title_sort |
dependence of the frequency of the kilohertz quasi-periodic oscillationson x-ray count rate and colors in 4u 1608–52 |
publishDate |
1999 |
url |
http://sedici.unlp.edu.ar/handle/10915/145974 |
work_keys_str_mv |
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bdutipo_str |
Repositorios |
_version_ |
1764820460361482240 |