Probing the gravitational field around neutron stars with Fe lines and kHz QPOs

Details Probing the gravitational field around neutron stars with Fe lines and kHz QPOs Probing the gravitational field around neutron stars with Fe lines and kHz QPOs

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..134m&link_type=abstract

XMM-Newton Proposal ID #06537901

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, 4U 1728-34

Scientific paper

Broad Fe lines have been detected in ten LMXBs. In two of these sources the inner accretion-disc radii inferred from the line and from the kHz QPOs are consistent, but the line and QPO measurements were not simultaneous. Using contemporaneous XMM-Newton/RXTE and Chandra/RXTE observations we have recently shown that in the LMXB 4U 1636-53 the Fe line and the kHz QPO yield different disc radii. The frequencies of the kHz QPOs correlate with the disc radius inferred from broad-band spectra, with the Fe line changing independently. We propose five simultaneous XMM-Newton/RXTE observations of the LMXB 4U 1728-34 with both a broad Fe line and kHz QPOs, using the long-term variability of this source to test the dynamics and the correlation of the radii inferred from the line and the kHz QPOs.

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