Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34

We have analyzed seventeen observations of the low-mass X-ray binary and atoll source 4U 1728–34, carried out by the Rossi X-ray Timing Explorer in 1996 and 1997. We obtain precise measurements of the frequencies of the two simultaneous kilohertz quasi-periodic oscillations (kHz QPOs) in this source...

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Detalles Bibliográficos
Autores principales: Méndez, Mariano R., van der Klis, Michiel
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 1999
Materias:
Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Stars: neutron
Stars: individual (4U 1728–34)
X-rays: stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123285
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123285
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Stars: neutron
Stars: individual (4U 1728–34)
X-rays: stars
spellingShingle Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Stars: neutron
Stars: individual (4U 1728–34)
X-rays: stars
Méndez, Mariano R.
van der Klis, Michiel
Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34
topic_facet Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Stars: neutron
Stars: individual (4U 1728–34)
X-rays: stars
description We have analyzed seventeen observations of the low-mass X-ray binary and atoll source 4U 1728–34, carried out by the Rossi X-ray Timing Explorer in 1996 and 1997. We obtain precise measurements of the frequencies of the two simultaneous kilohertz quasi-periodic oscillations (kHz QPOs) in this source. We show that the frequency separation between the two QPO, ∆ν, is always significantly smaller than the frequency of the nearly-coherent oscillations seen in this source during X-ray bursts, even at the lowest inferred mass accretion rate, when ∆ν seems to reach its maximum value. We also find that ∆ν decreases significantly, from 349.3 ± 1.7 Hz to 278.7 ± 11.6 Hz, as the frequency of the lower frequency kHz QPO increases from 615 to 895 Hz. This is the first time that variations of the kHz QPO peak separation are measured in a source which shows nearly-coherent oscillations during bursts.
format Articulo
Preprint
author Méndez, Mariano R.
van der Klis, Michiel
author_facet Méndez, Mariano R.
van der Klis, Michiel
author_sort Méndez, Mariano R.
title Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34
title_short Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34
title_full Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34
title_fullStr Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34
title_full_unstemmed Precise Measurements of the Kilohertz Quasi-Periodic Oscillations in 4U 1728-34
title_sort precise measurements of the kilohertz quasi-periodic oscillations in 4u 1728-34
publishDate 1999
url http://sedici.unlp.edu.ar/handle/10915/123285
work_keys_str_mv AT mendezmarianor precisemeasurementsofthekilohertzquasiperiodicoscillationsin4u172834
AT vanderklismichiel precisemeasurementsofthekilohertzquasiperiodicoscillationsin4u172834
bdutipo_str Repositorios
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