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Studies of some bright, super-Eddington transient pulsars show a negativecorrelation between the energy of the cyclotron resonance scattering feature(CRSF) and the bolometric luminosity. For Her X-1, using repeated RXTEobservations during 1996-2005, the inverse dependence was found: the energy ofthe cyclotron line increases as the luminosity increases. The X-ray fluxmeasured by the RXTE/ASM (2-10 keV) has been assumed to represent theluminosity - more precisely: the maximum X-ray flux reached during therespective 35 d Main-On. Here, we question whether the ASM flux is really anaccurate measure of the bolometric luminosity of the source. We redeterminedthe energy of the cyclotron line and performed spectral fits using the combineddata from the PCA (3.5-60 keV) and HEXTE (20-75 keV) instruments on RXTE of thesame 35 d cycles as used in the original work to determine the bolometric fluxfrom those spectra. We confirm the result of the original analysis that thecyclotron line energy changes by ~7% for a change in flux by a factor of two.

Her X-1: the positive cyclotron line energy / luminosity correlation