Pulse period history and cyclotron resonance feature of the X-ray pulsar 1E 2259+586

Details Pulse period history and cyclotron resonance feature of the X-ray pulsar 1E 2259+586 Pulse period history and cyclotron resonance feature of the X-ray pulsar 1E 2259+586

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44....9i&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 1, p. 9-14.

Astronomy and Astrophysics

Astronomy

72

Cyclotron Resonance, Periodic Variations, Pulsars, X Ray Binaries, Ginga Satellite, Stellar Magnetic Fields, Stellar Spectra, X Ray Spectra

Scientific paper

The results of two follow-up Ginga observations of 1E 2259+586 are presented. A secular spin-down trend was found to hold for more than 10 yr. However, the spin-down rate decreased as the X-ray flux increased for the first time in 1990. This supports a scenario that 1E 2259+586 is a binary X-ray pulsar in a nearly equilibrium state of spin-up and spin-down torque, and not an isolated white dwarf. In the X-ray spectrum, absorption features were found at 5-10 keV. The shape of the absorption features changed between the two observations and between different pulse phases. This absorption structure is likely to be due to cyclotron resonant scattering in a relatively weak magnetic field.

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