On the Nonrelativistic Origin of Redskewed Iron Lines in CV, Neutron Stars and Black Holes Available to Purchase

We present an XMM‐Newton EPIC/PN data analysis of the $Kα$ line detected in cataclysmic variable (CV) GK Per. We show that the iron $Kα$ emission line of GK Per has a noticeable redskewed profile. We compare the GK Per asymmetric line with the redskewed lines observed by XMM‐Newton in neutron star (NS) source Serpens X‐1 and black hole (BH) source BH GX 339‐4. The observations of the $Kα$ emission with redskewed features in CV GK Per indicate that this effect may be not only a BH particular signature related to General Relativity (GR). Also, recently an alternative model for broad red‐shifted iron line formation in an outflowing wind, a common phenomenon for CVs, NSs and BHs, has been suggested. In this paper we demonstrate that the asymmetric shapes of the lines detected from these CV, NS and BH sources are well described by this wind (outflow) model.