NICER observation list: Target ID 858501

Only two WR colliding wind systems with precise visual orbits have been well-studied with NICER, both involving WC stars. We request 80 ks (40 visits, each 2 ks) to conduct the first mapping of X-ray emission vs. binary phase for the visual binary WR 133 (WN5o + O9), containing a WN companion. This will provide a comparable X-ray dataset for a WN star in a colliding wind system. Our observations will map X-ray emission by orbital phase, model 1/D variations (D is the separation between the stars), and analyze plasma temperatures, absorption variability, and X-ray production relative to mass-loss rates. We will compare these findings to other systems, like γ2 Vel and WR140, with different Wolf-Rayet types.