Abstract
ABSTRACTSpectroscopic observations of two very different objects are discussed: the first, SS433, is a wery massive binary system probably containing an unseen 0 or WR star and a black hole surrounded by a luminous precessing accretion disk (from which emanate spectacular relativistic jets); the second, GK Per, is a classical old nova consisting of a slightly evolved K2 star and an unseen white dwarf companion surrounded by an accretion disk which is less luminous than the K2 star.
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