An in-depth analysis of the variable cyclotron lines in GX 301$-$2

Nicolas Zalot, Ekaterina Sokolova-Lapa, Jakob Stierhof +13

Context. The High-Mass X-ray Binary (HMXB) system GX 301$-$2 is a persistent source with a well-known variable cyclotron line centered at 35 keV. Recently, a second cyclotron line…