Abstract
X-ray observations of the eclipsing RS CVn binary AR Lac covering both primary and secondary minimum, obtained with the position sensitive proportional counter (PSPC) on-board ROSAT, are presented. The X-ray light curves clearly show a deep primary eclipse in all three PSPC spectral bandpasses covering the bands 0.1-0.28 keV, 0.4-1.1 keV, and 1.1-2.4 keV. A shallow secondary minimum occuring before phase 0.5 is seen in the total light curve. Phase-dependent spectral analysis is performed both with a two-temperature model as well as a hydrostatic loop model. During primary eclipse the emission measures of the low- and the high-temperature component drop, while the derived coronal temperatures show no orbital variation
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