Slow pulsating accreting neutron stars: the enigmatic case of 4U 2206+54

Details Slow pulsating accreting neutron stars: the enigmatic case of 4U 2206+54 Slow pulsating accreting neutron stars: the enigmatic case of 4U 2206+54

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...23r&link_type=abstract

XMM-Newton Proposal ID #06506401

Other

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, 4U 2206+54

Scientific paper

The discovery of pulsations (Pspin=5500s) has solved the controversy on the nature of the compact object in the HMXB 4U2206+54 but has prompted new questions. According to spin evolutionary models such slow pulsations require the system to harbor a magnetar (B~1e14 G). However, the significant detection of a cyclotron resonant scattering feature at 30 keV implies a magnetic field B~3x1e12 G. Another unsolved question is whether the presence of a soft thermal component, representing emission from the polar caps, is present in all accreting pulsars. This proposal seeks to estimate the magnetic field strength through the neutron star spin evolution and investigate with unprecedented detail the soft energy spectrum of 4U2206+54 to check whether the polar cap scenario is applicable.

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