ABSOLUTE DIMENSIONS AND MASSES OF IT CASSIOPEIAE

Accurate masses and radii have been determined from new spectroscopic and photometric observations and from previously published photometric observations and times of minima of this pair of F5 V stars. Previous reports of delta Scuti variations by the components appear to be erro neous. IT Cas has an eccentric orbit, but existing observations cover too small a fraction of the apsidal motion variations to fit an accura te apsidal period, which is estimated to be 2200 years based on theore tical models, These models give an age near 2 billion years for the bi nary star. Then is a small amount of color excess due to interstellar reddening. (C) 1997 American Astronomical Society.