According to this, our Earth's atmosphere is completely opaque to radiation with wavelengths less than 100 nm as this radiation has enough energy to ionize the air. Since the surface temperature of the Sun is about 6000 °K, it radiates most of it's energy in the visible and infrared regions. But what if the sun was replaced by a star with temperature of 50,000 °K ? According to Wien's displacement law, most of the radiation energy from this new star would be shifted to wavelengths of 60 nm, where the atmosphere is very opaque.
So how would the atmosphere behave for long times under this condition ? Also, would that mean that the temperature of the atmosphere will dramatically rise while the Earth's surface temperature stays low ?