A SURVEY OF HELIUM ACCRETING WHITE DWARFS

We propose to carry out a survey of AM CVn systems close binaries in which awhite dwarf is accreting material from a white dwarf. This will be the mostsensitive Xray survey of such objects. We will measure their luminosities anddetermine if they correlate with orbital period and Xray colour. The source ofXray emission in these systems is not known. These observations will allow usto make significant progress in answering this question. We will also search foremission lines in the Xray spectra this will allow us to constrain thechemical composition of these systems. These observations will provide the firstsimultaneous Xray and UV data with high time resolution: this is important inrelating the UV and Xray emission mechanisms. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]