2013A&A...552A..81M


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.16CEST09:28:37

2013A&A...552A..81M - Astronomy and Astrophysics, volume 552A, 81-81 (2013/4-1)

A 0535+26 in the April 2010 outburst: probing the accretion regime at work.

MUELLER D., KLOCHKOV D., CABALLERO I. and SANTANGELO A.

Abstract (from CDS):

A number of accreting X-ray pulsars experience spectral changes, both on the long time scales and on the time scales of the neutron star spin period. The sources seem to form two distinct groups that differ by the type of the spectral variations with flux. Such a bimodality probably reflects two different regimes of accretion that may result in a particular pulsar depending on its luminosity - so-called sub- and super-critical regimes. We investigated the behavior of the spectral parameters of the Be/X-ray binary system A0535+26, as a function of flux and pulse phase. We used the data collected with INTEGRAL and RXTE during the April 2010 outburst of the source. We analyzed the phase-averaged and phase-resolved spectra and performed pulse-to-pulse spectral analysis of the pulsar. Our analysis reveals variability in the continuum parameters of the source's pulse-averaged spectrum with flux. The pulse-averaged cyclotron line energy does not change with the source luminosity during the outburst, which is consistent with previous studies. Our pulse-phase resolved and pulse-to-pulse analyses reveal, however, indications for a positive correlation of the cyclotron line energy with flux, as well as a flux-dependence of the continuum parameters. Based on the observed behavior, we argue that A0535+26 operates at the sub-critical accretion regime.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: neutron - accretion, accretion disks - pulsars: individual: A 0535+26

Simbad objects: 6

goto Full paper

goto View the reference in ADS

Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 675 0
2 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 412 1
3 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5733 4
4 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 888 0
5 V* V850 Cen HXB 13 01 17.0966951298 -61 36 06.636402972   15.6 14.40     B2Vne 283 0
6 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1955 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2013A&A...552A..81M and select 'bookmark this link' or equivalent in the popup menu


2021.05.16-09:28:37

© Université de Strasbourg/CNRS

    • Contact