White Dwarf Masses and Spin Periods for Hard X-ray-Selected Galactic Sources

Accreting white dwarfs (WDs) can be strong emitters of Xrays. In intermediatepolar (IP) type cataclysmic variables, the accreting material is funneled ontothe WD.s magnetic poles. The Xrays are produced by shockheating, and thetemperature depends on the WD mass. Thus, Xray spectra provide a WD massmeasurement. An important question is whether the WD mass distribution extendsup to the Chandrasekhar limit. The best place to look for highmass WDs is amongIPs with the highest temperatures, making IPs found by INTEGRAL strongcandidates for hosting the most massive WDs. Here, we propose XMMNewton andNuSTAR observations of two IGR sources that are likely IPs. The goals includedetecting the WD spin period to confirm the IP natures of the sources and to measure the WD masses. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]