Pulse Frequency Changes of 1E 2259+586 and the Binary Interpretation

Details Pulse Frequency Changes of 1E 2259+586 and the Binary Interpretation Pulse Frequency Changes of 1E 2259+586 and the Binary Interpretation

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...460..470b&link_type=abstract

Astrophysical Journal v.460, p.470

Astronomy and Astrophysics

Astronomy

58

Stars: Binaries: Close, Stars: Pulsars: Individual Alphanumeric: 1E 2259+586, X-Rays: Stars

Scientific paper

Pulse frequencies from the archival ROSAT observations of lE 2259+586 are presented. A short-term spin-up episode superposed on the secular spin-down trend is observed. Combining the previously published pulse frequencies, we estimate the variance of the angular velocity over a 15 yr span of observations. The level of fluctuations in angular velocity is similar to that of established accreting binary neutron stars. These results favor accretion by a neutron star from a very low mass companion as the source of the X-ray luminosity, although accretion by a solitary neutron star from a residual disk might be possible.

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