Recent Spin Rate Measurements of 4U 1907+09

Creative Commons License

Sahiner S., İNAM S. Ç. , BAYKAL A.

Conference on Astrophysics of Neutron Stars in Honor of M Ali Alpar (ASTRONS), Cesme, Türkiye, 2 - 06 Ağustos 2010, cilt.1379 identifier identifier

  • Cilt numarası: 1379
  • Doi Numarası: 10.1063/1.3629521
  • Basıldığı Şehir: Cesme
  • Basıldığı Ülke: Türkiye


In this study, X-ray spectral and pulse timing analysis of the high mass X-ray binary (HMXB) pulsar 4U 1907+09, based on the observations with RXTE are presented. Spin rate measurements indicate a new spin-down episode with a rate close to the previous steady spin-down rate. Orbital phase resolved spectroscopy reveals that the Hydrogen column density varies through the orbit reaching to its maximum value just after periastron. A slight spectral softening with increasing luminosity is aslo observed.