Ginga observations of Hercules X-1:: Spectrum dependence on 35 day phase

Her X-1 was observed with good coverage and good sensitivity over a wide range of 35 day phase with the Ginga LAC in 1988 and 1989. Although several small sections have been previously studied, the spectra from this full set of observations have not been analyzed previously. Main high, short high, and low state spectra all require a two component continuum (absorbed and unabsorbed). Dips and eclipses were identified and the behavior of spectral parameters outside these events is studied. Excluding dips/eclipses, the iron line energy is similar or equal to6.60 keV (whereas during dips/eclipses, it drops to similar or equal to6.4 keV); the column density of the absorbed component is N-H similar or equal to 10(24.0)cm(-2); and the power-law index is alpha similar or equal to 0.95. The iron line intensity is well correlated with the total continuum intensity, indicating that reprocessing is important at all times and that a major source of the iron line is the accretion column during main high. The iron line equivalent width (EW) varies between main high, short high, and low states, with mean values for each state of 0.48 keV, 0.66 keV, and similar or equal to1.37 keV, respectively. The ratio of absorbed continuum to unabsorbed continuum, R, also varies with 35 day phase, and EW is correlated with R. The behaviors of absorbed and unabsorbed continuum normalizations, EW and R are consistent with the accretion-column inner-disk model of Scott, Leahy, & Wilson.