Long-term X-ray Timing of Ultra-compact Binaries

Details Long-term X-ray Timing of Ultra-compact Binaries Long-term X-ray Timing of Ultra-compact Binaries

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop...61s&link_type=abstract

XMM-Newton Proposal ID #05518602

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Rx J0806.3+1527, Rx J1914.4+2456, Xmm-Newton Proposal Id #05518602

Scientific paper

We propose short timing observations of V407 Vul, and RX J0806.3+2756; unique binary systems with the shortest inferred orbital periods known. Both systems show secular spin up of their phase-locked X-ray and optical pulsations with rates consistent with orbital evolution driven by gravitational radiation losses. Phase coherent timing of all current data for these sources is approaching the level at which the second frequency derivative can be measured. The value of this quantity is an important discriminator for models of the X-ray emission in these objects (Dall'Osso et al. 2007; Deloye & Taam 2006), and future, precise constraints on this parameter require simply that the existing timing baseline continue to be extended with short, annual observations. Here we propose such observations

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