2006A&A...451..187M


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET19:05:20

2006A&A...451..187M - Astronomy and Astrophysics, volume 451, 187-194 (2006/5-3)

INTEGRAL observation of the high-mass X-ray transient V0332+53 during the 2005 outburst decline.

MOWLAVI N., KREYKENBOHM I., SHAW S.E., POTTSCHMIDT K., WILMS J., RODRIGUEZ J., PRODUIT N., SOLDI S., LARSSON S. and DUBATH P.

Abstract (from CDS):

The decline of the high mass X-ray transient V0332+53 during the Dec. 2004 to Feb. 2005 outburst is analysed from the data recorded by INTEGRAL. The flux is shown to decrease exponentially until 2005 Feb. 10, with a decay time scale of ∼30-days above 20keV and ∼20-days at lower energies, and to decrease linearly thereafter. The energy spectrum is well modelled throughout the decay by a power law with a folding energy of ∼7.5keV, and with two cyclotron absorption features. The folding energy does not vary significantly over the decay, but the spectrum becomes harder with time. Most importantly, we show that the parameters describing the fundamental cyclotron line around 27keV do vary with time: its energy and depth increase (by about 17% for the energy in ∼6 weeks), while its width decreases. These changes of the cyclotron line parameters are interpreted as resulting from a change in the extent of the cyclotron scattering region. Two quasi-periodic oscillations are also observed at various times during the observations, one at 0.05Hz and another one near the pulsation frequency around 0.23Hz.

Abstract Copyright:

Journal keyword(s): X-ray: stars - stars: pulsars: individual: V0332+53 - stars: magnetic fields - X-ray: bursts

CDS comments: Paragraph 5.2. 4U 0115+53 is a misprint for 4U 0115+63.

Simbad objects: 3

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Number of rows : 3

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 670 0
2 V* BQ Cam HXB 03 34 59.9116460415 +53 10 23.296351781   17.16 15.42 14.26 13.04 O8.5Ve 408 1
3 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 611 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-19:05:20

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