Abstract
IUE and ground-based observations of 48 Librae were carried out simultaneously in July, 1981. The main results are: (1) no progression was observed in the Balmer lines; (2) the photographic metallic lines have radial velocities around +30 km/s; (3) the radial velocities of the UV lines formed in the cool envelope are grouped around the value +20 km/s with a higher dispersion than the photographic metallic lines; (4) the lines originating in the transition region yield negative velocities; (5) the continuum energy distribution corresponds to Te = 16000K and log g = 4.5, and (6) Ca II λ3933 Å has no chromospheric components.
