DETECTION OF BORON, COBALT, AND OTHER WEAK INTERSTELLAR LINES TOWARD ZETA-OPHIUCHI

Numerous weak lines from interstellar atomic species toward zeta Ophiu chi were observed with the Goddard High-Resolution Spectrograph. Of pa rticular note are the first interstellar detection of cobalt and the d etection of boron in this sight line. These measurements provide estim ates for the amount of depletion for the two elements. Boron, a volati le, and cobalt, a refractory element, display the depletion pattern fo und by Savage, Cardelli, & Sofia (1992). The abundance of phosphorus i n the H II region associated with the star was obtained from a detecti on of P III. Additional weak lines from S I, C I; Ni II, and Cu II wer e detected for the first time; these lines provide the basis for refin ements in oscillator strength and column density. Analysis of the neut ral sulfur data indicates that the atomic gas is more widely distribut ed than the molecular material in the main component.