An atlas of burst oscillations and spectral properties in 4U 1728-34

We study correlations between the burst properties and the position in the color-color diagram of the low mass X-ray binary 4U 1728-34 using 21 bursts found in two data sets obtained with the <i>Rossi X-Ray Timing Explorer</i>. Using spectral fits we analyze the spectral evolution during...

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Autores principales: Straaten, Steve van, Klis, Michiel van der, Kuulkers, Erik, Méndez, Mariano R.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Astronómicas
Accretion,accretion disks
Binaries: close
Stars: individual (4U 1728-34)
Stars: neutron
X-rays: bursts
X-rays: stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84892
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84892
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
Binaries: close
Stars: individual (4U 1728-34)
Stars: neutron
X-rays: bursts
X-rays: stars
spellingShingle Ciencias Astronómicas
Accretion,accretion disks
Binaries: close
Stars: individual (4U 1728-34)
Stars: neutron
X-rays: bursts
X-rays: stars
Straaten, Steve van
Klis, Michiel van der
Kuulkers, Erik
Méndez, Mariano R.
An atlas of burst oscillations and spectral properties in 4U 1728-34
topic_facet Ciencias Astronómicas
Accretion,accretion disks
Binaries: close
Stars: individual (4U 1728-34)
Stars: neutron
X-rays: bursts
X-rays: stars
description We study correlations between the burst properties and the position in the color-color diagram of the low mass X-ray binary 4U 1728-34 using 21 bursts found in two data sets obtained with the <i>Rossi X-Ray Timing Explorer</i>. Using spectral fits we analyze the spectral evolution during the bursts and determine the burst peak flux, temperature, rise time, and fluence. Using dynamical power spectra, we study the properties of the ∼ 363 Hz burst oscillations. We find correlations between fluence, peak flux, the occurrence of radius expansion, and the presence of burst oscillations and the position of the source in the color-color diagram. The radius expansion bursts with and without burst oscillations differ both with respect to where they occur in the color-color diagram and in how the radius expansion takes place. We compare our results with those of a similar study by Muno and coworkers for KS 1731-26. Both KS 1731-260 and 4U 1728-34 show more or less the same behavior with respect to the dependence of the presence/absence of the burst oscillations on the position of the source in the color-color diagram, but the dependence of most of the spectral burst parameters on the position in the color-color diagram is clearly different. We find that the systematic absence in 4U 1728-34 of burst oscillations in the "island" state of the color-color diagram is not explained by the bursts involving mixed H-He burning, as Cumming & Bildsten found may be the case in KS 1731-260.
format Articulo
Articulo
author Straaten, Steve van
Klis, Michiel van der
Kuulkers, Erik
Méndez, Mariano R.
author_facet Straaten, Steve van
Klis, Michiel van der
Kuulkers, Erik
Méndez, Mariano R.
author_sort Straaten, Steve van
title An atlas of burst oscillations and spectral properties in 4U 1728-34
title_short An atlas of burst oscillations and spectral properties in 4U 1728-34
title_full An atlas of burst oscillations and spectral properties in 4U 1728-34
title_fullStr An atlas of burst oscillations and spectral properties in 4U 1728-34
title_full_unstemmed An atlas of burst oscillations and spectral properties in 4U 1728-34
title_sort atlas of burst oscillations and spectral properties in 4u 1728-34
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/84892
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