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Variability of winds in X-ray binaries

Published online by Cambridge University Press:  21 February 2013

M. Díaz Trigo ,
L. Boirin ,
S. Migliari ,
J. Miller-Jones ,
A. Parmar  and
L. Sidoli
M. Díaz Trigo
Affiliation:
ESO, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany email: [email protected]
L. Boirin
Affiliation:
Observatoire Astronomique de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg, France
S. Migliari
Affiliation:
DAM and ICC (IEEC-UB), Universitat de Barcelona, Mart i Franqus 1, 08028 Barcelona, Spain
J. Miller-Jones
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
A. Parmar
Affiliation:
ESAC, P.O. Box 78, E-28691 Villanueva de la Cañada, Madrid, Spain
L. Sidoli
Affiliation:
INAF-IASF, via Bassini 15, I-20133 Milano, Italy
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Abstract

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We discuss the variability of winds in two low-mass X-ray binaries, GX 13+1 and 4U 1630-47. XMM-Newton observations of these sources show that strong, photoionised winds with column densities well above 1022 cm−2 can be present in both neutron star and black hole LMXBs. Such winds can fade significantly due to changes in the flux or spectral hardness of the continuum. In particular, a decrease of column density and/or an increase of ionisation are measured when the flux increases or the spectrum hardens. We show how variability studies can help us to understand what triggers changes in the wind and discuss the limitations of current instruments for such studies.

Keywords

X-rays: binaries accretionaccretion disks - Stars: neutron - Black hole physics - Spectroscopy
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 25 - 28
Copyright
Copyright © International Astronomical Union 2013

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