From Super-Eddington to zero: following a Z source into quiescence

Astronomy and Astrophysics – Astronomy

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Chandra Proposal Id #08400982

Scientific paper

XTE J1701-462 is likely the most luminous Galactic transient neutron star LMXB (NSXB) in the history of X-ray astronomy. Early observations have already challenged our view on the role of mass accretion rate in NSXBs. Observing XTE J1701-462 as it returns to quiescence creates a unique opportunity to study the effects of mass-accretion rate on the spectral/variability properties in a single NSXB over an unprecedented luminosity range. We propose a Chandra/XMM-Newton TOO program with two goals: 1) observe the source during the end of the decay and in quiescence, to complete what might well become a 'Rosetta stone' for NSXBs and 2) constrain the structure of neutron stars by studying the effects of super-Eddington accretion on the cooling of the crust/core in transient NSXBs.

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