NEW STUDY OF THE QUASI-MOLECULAR LYMAN-ALPHA SATELLITES DUE TO H-H AND H-H+ COLLISIONS

We present new theoretical calculations of the total profile of the at omic hydrogen Lyman ct spectral line perturbed by collisions with neut ral hydrogen atoms and protons. The variation of the radiative dipole moment during the collision is taken into account. This leads to an in crease in the amplitude of the main spectral line satellites and to a quantitative improvement of the synthetic spectra of lambda Bootis sta rs compared to IUE observations.