2008A&A...491..833K


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.01CET00:43:24

2008A&A...491..833K - Astronomy and Astrophysics, volume 491, 833-840 (2008/12-1)

Giant outburst of EXO 2030+375: pulse-phase resolved analysis of INTEGRAL data.

KLOCHKOV D., SANTANGELO A., STAUBERT R. and FERRIGNO C.

Abstract (from CDS):

In June-September 2006 the Be/X-ray binary EXO 2030+375 experienced the second giant outburst since its discovery. The source was shown to have a complicated pulse-averaged X-ray spectral continuum with possible evidence of cyclotron absorption features. In this paper we present the first pulse-phase resolved analysis of the broad band X-ray spectra of EXO 2030+375 obtained with the INTEGRAL observatory close to the maximum and during the decay phase of the giant outburst. We report a strong variability of the spectrum with pulse phase. Alternative spectral continuum models are discussed. The dependence of the spectral parameters on pulse phase during the maximum of the outburst and the evolution of the pulse profiles with time are qualitatively consistent with the pulsar's emission diagram changing from the fan-beam geometry close to the maximum of the outburst to a combination of pencil and fan beams (of comparable intesities) at the end of the decay phase. Evidence of a cyclotron absorption line around 63keV at the pulse phase interval preceeding the main peak of the pulse profile is present in the spectrum obtained close to the maximum of the outburst.

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Journal keyword(s): stars: neutron - X-rays: binaries - accretion, accretion disks

Simbad objects: 6

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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 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 879 0
2 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1933 0
3 2MASS J18453684+0051474 HXB 18 45 36.8356137141 +00 51 47.438374606     20.6     B0-2IV-Ve 104 0
4 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3957 0
5 V* V2246 Cyg HXB 20 32 15.2744631713 +37 38 14.839930326   22.16 19.41 17.32 15.18 B0Ve 381 0
6 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1787 2

    Equat.    Gal    SGal    Ecl

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2020.12.01-00:43:24

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