2011A&A...529A..52D


Query : 2011A&A...529A..52D

2011A&A...529A..52D - Astronomy and Astrophysics, volume 529A, 52-52 (2011/5-1)

Witnessing the magnetospheric boundary at work in Vela X-1.

DOROSHENKO V., SANTANGELO A. and SULEIMANOV V.

Abstract (from CDS):

We present an analysis of the Vela X-1 ``off-states'' based on Suzaku observations taken in June 2008. Defined as states in which the flux suddenly decreases below the instrumental sensitivity, these ``off-states'' have been interpreted by several authors as the onset of the ``propeller regime''. For the first time ever, however, we find that the source does not turn off and, although the flux drops by a factor of 20 during the three recorded ``off-states'', pulsations are still observed. The spectrum and the pulse profiles of the ``off-states'' are also presented. We discuss our findings in the framework of the ``gated accretion'' scenario and conclude that most likely the residual flux is due to the accretion of matter leaking through the magnetosphere by means of Kelvin-Helmholz instabilities (KHI).

Abstract Copyright:

Journal keyword(s): X-rays: binaries - pulsars: individual: Vela X-1

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* GP Vel HXB 09 02 06.8608812864 -40 33 16.899168060 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1502 0
2 V* V2246 Cyg HXB 20 32 15.2749858128 +37 38 14.843024844   22.16 19.41 17.32 15.18 B0Ve 436 0

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