DR. VARUN BHALERAO

Cyclotron lines in X-ray binaries provide us with excellent opportunities to understand the accretion physics of these systems. The speaker will discuss some NuSTAR results on cyclotron line variability in Cep X-4. He will then provide a sneak peek into ongoing work about pulse-phase resolved studies of this line. Next, he will show some early results of the ongoing analysis of a joint XMM-NuSTAR study of the supergiant fast X-ray transient IGRJ17544-2619, where the cyclotron line energy has changed by almost a factor of two between two luminosity states of this binary.