XMM-Newton Proposal 02059801

Physics

Scientific paper

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Wx Lmi, Xmm-Newton Proposal 02059801

Scientific paper

Low-accretion rate polars escaped detection in the RASS and were discovered recently in chance in optical surveys (HQS, SDSS) as CVs in permanent states of low accretion. The presence of such systems is not predicted by current theories of CV evolution. Establishing their detailed properties is the first important step in understanding their role in this respect. We propose XMM-Newton observations with full-phase coverage of the brightest of the presently known 4 systems. With EPIC we test the bombardement accretion scenario. With the OM we determine the photospheric temperature distribution of the accreting white dwarf. This experiment is important for our understanding of the secular heating and cooling processes in accreting magnetic white dwarfs.

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