The High-Mass X-ray Binaries V0332+53 comma 4U0115+63 comma and A0535+262 in Quiescence

The propeller effect should cut off accretion in fastspinning neutron starhighmass Xray binaries at low mass transfer rates. Accretion seems to becontinuing in some HMXBs observed at Lx < 1e34 ergs/s, as evidenced bycontinuing pulsations. However, indications of spectral softening in systems inthe propeller regime suggest that some highmass Xray binaries are undergoingfundamental changes in their accretion regime. We propose to use XMM to measurethe minimum Lx in three quiescent systems known to be in the propeller regime,look for pulsations in deep quiescence, and study their spectral shape,particularly looking for blackbody components from the poles or complete neutronstar surface. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]