An XMM–Newton observation of the neutron star X-ray transient 2S 1803−245 in quiescence |
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| Authors: | R Cornelisse R Wijnands J Homan |
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| Affiliation: | Instituto de Astrofísica de Canarias, Vía Láctea, La Laguna E-38200, Santa Cruz de Tenerife, Spain;School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ;Astronomical Institute 'Anton Pannekoek', University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, the Netherlands;MIT Kavli Institute for Astrophysics and Space Research, 77 Massachusetts Avenue, Cambridge, MA 02139, USA |
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| Abstract: | We observed the neutron star X-ray transient 2S 1803?245 in quiescence with the X-ray satellite XMM–Newton , but did not detect it. An analysis of the X-ray bursts observed during the 1998 outburst of 2S 1803?245 gives an upper limit to the distance of ≤7.3 kpc, leading to an upper limit on the quiescent 0.5–10 keV X-ray luminosity of ≤2.8 × 1032 erg s?1 (3σ). Since the expected orbital period of 2S 1803?245 is several hours, this limit is not much higher than those observed for the quiescent black hole transients with similar orbital periods. |
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| Keywords: | accretion accretion discs stars: individual: 2S 1803?245 stars: neutron X-rays: binaries |
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