The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity

We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aq1 X-1. Each source traces out a set of nearly parallel tracks in a frequency versus X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency...

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Detalles Bibliográficos
Autores principales: Méndez, Mariano R., Klis, Michiel van der, Ford, Eric C.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Astronómicas
Accretion, accretion disks
Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1)
Stars: neutron
X-rays: stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84694
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84694
record_format 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 1608-52, 4U 1728-34, Aquila X-1)
Stars: neutron
X-rays: stars
spellingShingle Ciencias Astronómicas
Accretion, accretion disks
Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1)
Stars: neutron
X-rays: stars
Méndez, Mariano R.
Klis, Michiel van der
Ford, Eric C.
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity
topic_facet Ciencias Astronómicas
Accretion, accretion disks
Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1)
Stars: neutron
X-rays: stars
description We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aq1 X-1. Each source traces out a set of nearly parallel tracks in a frequency versus X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency, the 2-60 keV source count rate can differ by up to a factor of ∼4, whereas at the same time the rms amplitude of the kHz QPOs is only a factor of ∼1.1 different. We also find that, for 4U 1608-52 and Aq1 X-1, the rms spectrum of the kHz QPOs does not depend upon which track the source occupies in the frequency versus X-ray count rate diagram. Our results for 4U 1728-34, 4U 1608-52, and Aq1 X-1 are inconsistent with simple "extra source of X-rays" scenarios for the parallel tracks, such as those in which the properties of the kHz QPOs are determined only by the mass accretion rate through the disk, whereas X-ray count rate also depends upon other sources of energy that do not affect the QPOs.
format Articulo
Articulo
author Méndez, Mariano R.
Klis, Michiel van der
Ford, Eric C.
author_facet Méndez, Mariano R.
Klis, Michiel van der
Ford, Eric C.
author_sort Méndez, Mariano R.
title The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity
title_short The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity
title_full The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity
title_fullStr The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity
title_full_unstemmed The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity
title_sort amplitude of the kilohertz quasi-periodic oscillations in 4u 1728-34, 4u 1608-52, and aquila x-1, as a function of x-ray intensity
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/84694
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