Recent Spin Rate Measurements of 4U 1907+09
S. Sahiner (1), S.C. Inam (2), A. Baykal (1) ((1) METU, (2) Baskent, University)
TL;DR
This paper presents X-ray spectral and timing analysis of the HMXB pulsar 4U 1907+09, revealing a new spin-down episode, orbital phase-dependent absorption, and spectral softening correlated with luminosity.
Contribution
It provides new measurements of the pulsar's spin-down rate and orbital phase-resolved spectral variations using RXTE data.
Findings
Detected a new spin-down episode with a rate similar to previous measurements.
Orbital phase-resolved spectroscopy shows hydrogen column density peaks after periastron.
Observed spectral softening as luminosity increases.
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 also observed.
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