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The transient neutron star X-ray binary KS 1741–293 in outburst and quiescence

Published online by Cambridge University Press:  21 February 2013

N. Degenaar  and
R. Wijnands
N. Degenaar
Affiliation:
University of Michigan, Dept. of Astronomy, 500 Church St, Ann Arbor, MI 48109, USA email: degenaar@umich.edu
R. Wijnands
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam Postbus 94249, 1090 GE Amsterdam, The Netherlands email: r.a.d.wijnands@uva.nl
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Abstract

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KS 1741–293 is a transient neutron star low-mass X-ray binary that is located at an angular distance of ≃20′ from the Galactic center. We map out the historic activity of the source since its discovery in 1989, characterize its most recent X-ray outbursts observed with Swift (2007, 2008, 2010, and 2011), and discuss its quiescent X-ray properties using archival Chandra data. KS 1741–293 is frequently active, exhibiting outbursts that typically reach a 2–10 keV luminosity of LX ≃ 1036 (D/6.2 kpc)2 erg s−1 and last for several weeks–months. However, Swift also captured a very short and weak accretion outburst that had a duration of ≲4 days and did not reach above LX ≃ 5×1034 (D/6.2 kpc)2 erg s−1. The source is detected in quiescence with Chandra at a 2–10 keV luminosity of LX ≃ 2.5×1032 (D/6.2 kpc)2 erg s−1.

Keywords

Accretionaccretion disksstars: neutronX-rays: binariesX-rays: individual (KS 1741–293)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 113 - 116
Copyright
Copyright © International Astronomical Union 2013

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