CONTRIBUTION TO THE STUDY OF F-BINARIES, G-BINARIES, K-BINARIES, M-BINARIES .6. HD-79968, DOUBLE-LINED SPECTROSCOPIC BINARY

HD 79968 has been known for some time as a spectroscopic binary, but t he orbit of this system remained unknown until now. Our observations, carried out at Observatoire de Haute-Provence with the CORAVEL spectro meter, lead to the following orbital elements: P = 30.50253 days; T = 2448008.696 JD; omega = 65 degrees.8; e = 0.187; K-1 = 40.3 km/s; K-2 = 45.3 km/s; V-0 = +25.3 km/s; alpha(1) sin i = 16.6 Gm; alpha(2) sin i = 18.7 Gm; M(1) sin(3)i = 1.00 M.; M(2) sin(3)i = 0.89 M.. The ratio of the correlation dip areas indicates a magnitude difference Delta m (B) similar to 0.9 between the components. The observational data (M(1 ,2) sin(3)i, Delta m, M(V), B - V and the spectrum) are consistent wit h spectral types G3-4V and G9V for the primary and secondary component s respectively. The M(1) sin(3)i value, one solar mass, suggests stron gly that i should be near 90 degrees. This detached system (alpha = 50 R.) thus might be an eclipsing one.