Chandra observations of an engimatic class of faint accreting slow pulsators

We propose a series of 1 ksec Chandra observations of an enigmatic class ofobjects: faint to very faint accreting slow pulsators with period greater thanseveral hundreds of seconds. The nature of these objects is unclear; likely theyare neutron stars accreting from a highmass companion star, but often anaccreting magnetized white dwarf nature (i.e., an intermediate polar) cannot beexcluded. With our proposed Chandra observations we will obtain a position ofthese sources which will be used to identify their optical/IR counterpart,crucial in determining the exact nature of these systems. In addition, werequest short (5 ksec) XMMNewton observations of the same targets which willresult in good spectra and allow for searches to be undertaken for any spinperiod derivatives. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]