SPECTROSCOPIC COMPONENTS IN MULTIPLE SYSTEMS - COUTEAU-327 AND 542

Single-lined spectroscopic subsystems with periods of 70.5 and 118.5 d ays were discovered in the visual double stars Cou 327 = HD 193797 and Cou 542 = HD 216963. respectively. The elements of their spectroscopi c orbits were calculated. The preliminary visual orbit of Cou 327 was computed for the first time (P = 35 years), and an improved visual spe ctroscopic orbit of Cou 542 (P = 30.5 years) was also obtained. Dynami cal parallaxes were estimated. The invisible component of Cou 542 may be a white dwarf, and the orientation of the orbit for the close subsy stem can be determined from special high-precision interferometric obs ervations of submotion in the visual pair.