Journal
ASTROPHYSICAL JOURNAL
Volume 688, Issue 2, Pages 1288-1294Publisher
IOP PUBLISHING LTD
DOI: 10.1086/592429
Keywords
accretion, accretion disks; binaries: close; stars: individual (4U 1636-536); stars: neutron; X-rays: binaries; X-rays: stars
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Funding
- NASA [NNG05GQ18G, NNX07AV06G]
- ESA member states
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We present an analysis of XMM-Newton and RXTE data from three observations of the neutron star LMXB 4U 1636-536. The X-ray spectra show clear evidence of a broad, asymmetric iron emission line extending over the energy range 4-9 keV. The line profile is consistent with relativistically broadened Fe K alpha emission from the inner accretion disk. The Fe K alpha line in 4U 1636-536 is considerably broader than the asymmetric iron lines recently found in other neutron star LMXBs, which indicates a high disk inclination. We find evidence that the broad iron line feature is a combination of several K alpha lines from iron in different ionization states.
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