Monitoring the spectral evolution of RXJ0720-3125 and determining its nature

Details Monitoring the spectral evolution of RXJ0720-3125 and determining its nature Monitoring the spectral evolution of RXJ0720-3125 and determining its nature

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2937k&link_type=abstract

Chandra proposal ID #11500011

Physics

Scientific paper

RX J0720.4-3125 belongs to a group of radio-quiet isolated neutron stars, whose spectra are characterized by a blackbody spectrum plus one or more broad absorption features. It is unique in that its blackbody temperature, and the depth of the absorption feature is variable. The cause for this spectral evolution is unclear, but one proposed model is free precession of a neutron star with two hot spots. However, the exact precession period, if it exists, is not well known, but must be of the order of 10 yr. Alternatively, an unknown cause may have heated the atmosphere or changed the magnetic field configuration. In that case one may expect that at some point the source changes back to the situation before 2003.

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