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In neutron star and black hole X-ray binaries the transitions between the twospectral states, hard and soft, signals the change between accretion via a hotadvection-dominated flow(ADAF) and disk accretion. In a few cases the hard/softtransition were observed during the rise to the nova outburst, mostly only thesoft/hard transition during the luminosity decrease. Surprisingly theluminosities at the second transition is always lower by a factor of 3 to 5. Amodel for this hysteresis was presented in a preceding paper: It was shown thatthis switch in the accretion mode at different mass accretion rates andtherefore different luminosities is caused by the different amount of Comptoncooling or heating of the accretion disk corona as it is irradiated by hard orsoft radiation from the central light source, respectively. We now givedetailed results on the dependence on hardness of this radiation and onradiation efficiency. We further discuss the influence of the inclination and apossible warping of the disk on the observed hysteresis.Comment: 8 pages, 2 figures, accepted for publication in A&

Spectral state transitions in low-mass X-ray binaries – the effect of hard and soft irradiation