Collision induced absorption in M dwarfs and cool white dwarfs

In a recent review paper (Borysow & Jorgensen 1999) we presented a general overview of calculations of collision induced absorption (CIA) with application to stellar atmospheres. In the present contribution we will describe our recent preliminary results of new, accurate, quantum mechanical computations of the H-2-H-2 and H-2-He CIA, applicable to M dwarf stars and cool helium- and hydrogen-rich white dwarfs. The data, which are applicable for modelling the atmospheres of cool stars as well as giant planets, will become available at the www site http://www.astro.ku.dk/similar to aborysow/programs/.