AAS 207th Meeting, 8-12 January 2006
Session 72 Neutron Stars and X-ray Binaries
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[72.02] X-ray Timing of Two Nearby Isolated Neutron Stars

D. L. Kaplan (MIT), M. H. van Kerkwijk (University of Toronto)

We will report on our recent X-ray timing program of two nearby, isolated neutron stars: the 8.39-s RX J0720.4-3125 and the 5.16-s RX J1308.6+2127. By combining new, dedicated Chandra observations with archival Chandra, XMM-Newton, and ROSAT observations, we have been able to determine phase-coherent timing solutions for both sources stretching back at least 5 years. These solutions imply similar magnetic fields (2.4e13 G and 3.4e13 G) and spin-down ages (1.9 Myr and 1.5 Myr). We will discuss these solutions in the context of the population of similar objects and as they influence our understanding of the broad X-ray absorption features in their X-ray spectra.

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