2008A&A...480L..17C


Query : 2008A&A...480L..17C

2008A&A...480L..17C - Astronomy and Astrophysics, volume 480, L17-20 (2008/3-3)

The pre-outburst flare of the A0535+26 August/September 2005 outburst.

CABALLERO I., SANTANGELO A., KRETSCHMAR P., STAUBERT R., POSTNOV K., KLOCHKOV D., CAMERO-ARRANZ A., FINGER M.H., KREYKENBOHM I., POTTSCHMIDT K., ROTHSCHILD R.E., SUCHY S., WILMS J. and WILSON C.A.

Abstract (from CDS):

We study the spectral and temporal behavior of the High Mass X-ray Binary A0535+26 during a ``pre-outburst flare'' which took place ∼5d before the peak of a normal (type I) outburst in August/September 2005 . We compare the studied behavior with that observed during the outburst. We analyse RXTE observations that monitored A0535+26 during the outburst. We complete spectral and timing analyses of the data. We study the evolution of the pulse period, present energy-dependent pulse profiles both at the initial pre-outburst flare and close to outburst maximum, and measure how the cyclotron resonance-scattering feature (hereafter CRSF) evolves. We present three main results: a constant period P=103.3960(5)s is measured until periastron passage, followed by a spin-up with a decreasing period derivative of {dot}(P)=(-1.69±0.04)x10–8s/s at MJD 53618, and P remains constant again at the end of the main outburst. The spin-up provides evidence for the existence of an accretion disk during the normal outburst. We measure a CRSF energy of Ecyc∼50keV during the pre-outburst flare, and Ecyc∼46keV during the main outburst. The pulse shape, which varies significantly during both pre-outburst flare and main outburst, evolves strongly with photon energy.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: magnetic fields - stars: individual: A0535+26

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 - 2022
#notes
1 V* V635 Cas HXB 01 18 31.9704955824 +63 44 33.072603144 17.05 16.64 15.19 14.34 13.22 B0.2Ve 695 0
2 V* BQ Cam HXB 03 34 59.9116110096 +53 10 23.296879776   17.16 15.42 14.26 13.04 O8.5Ve 435 1
3 HD 245770 HXB 05 38 54.5748918624 +26 18 56.836952784 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 931 0
4 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 1998 0
5 4U 1850-03 HXB 18 48 17.7 -02 25 13           Be? 103 1
6 V* V2246 Cyg HXB 20 32 15.2749858128 +37 38 14.843024844   22.16 19.41 17.32 15.18 B0Ve 404 0

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2022.10.04-12:35:32

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