Pulse frequency changes of 1E 2259+586 and the binary interpretation

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Baykal A. , Swank J.

ASTROPHYSICAL JOURNAL, cilt.460, sa.1, ss.470-477, 1996 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 460 Konu: 1
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1086/176985
  • Sayfa Sayıları: ss.470-477


Pulse frequencies from the archival ROSAT observations of 1E 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.