Recent Spin Rate Measurements of 4U 1907+09

Details Recent Spin Rate Measurements of 4U 1907+09 Recent Spin Rate Measurements of 4U 1907+09

2011-04-26

arxiv.org/abs/1104.4898v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

3 pages, 1 figure, Conference proceeding of "Astrophysics of Neutron Stars 2010 -- a conference in honor of M. Ali Alpar", 2-6

Scientific paper

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 also observed.

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