Variability in Quiescent Neutron Star Binaries in Dense Globular Clusters

Details Variability in Quiescent Neutron Star Binaries in Dense Globular Clusters Variability in Quiescent Neutron Star Binaries in Dense Globular Clusters

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2574h&link_type=abstract

Chandra proposal ID #10400572

Computer Science

Scientific paper

We propose to re-observe four rich globular clusters (Terzan 5, NGC 6388, NGC 6266, and NGC 6440), which have been previously observed by Chandra and found to contain 5 or more quiescent neutron star binaries with L_X>10^32 ergs/s. Our goal is to measure the years-timescale spectral and luminosity variability of the quiescent neutron star X-ray binaries seen in these clusters. Detecting variability in the thermal component of quiescent X-ray binaries would prove that accretion continues into quiescence, and that the thermal component can be produced by accretion. This study surveys seventeen quiescent X-ray binaries with sufficient sensitivity to draw strong conclusions about low-level accretion and the nature of the thermal component.

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