Recent Spin Rate Measurements of 4U 1907+09


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Sahiner S., İNAM S. Ç. , BAYKAL A.

Conference on Astrophysics of Neutron Stars in Honor of M Ali Alpar (ASTRONS), Cesme, Turkey, 2 - 06 August 2010, vol.1379 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 1379
  • Doi Number: 10.1063/1.3629521
  • City: Cesme
  • Country: Turkey

Abstract

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.