Be X-ray binary pulsar SXP 138: non-linear spin-down, pulse and spectral characteristics

Soham Pravin Sanyashiv, Sayantan Bhattacharya, Sudip Bhattacharyya

We study the timing and spectral properties of the Be/X-ray binary pulsar SXP 138 using four NuSTAR observations spanning 2016 to 2017. Analysis of the light curves using the Lomb-…