Contribution to the study of F, G, K, M binaries .7. HD 147395, a M giant spectroscopic binary

HD 147395, a giant M2 star, was found to be a spectroscopic binary by the Mount Wilson astronomers some time ago, but its orbit remained unknown so far. Radial velocity observations carried out at the Observatoire de Haute-Provence with the CORAVEL spectrovelocimeter permitted us to obtain the orbital elements of this binary. They are as follows: P = 335.537 days; T = 4448335.0 JD; omega = 336.9 degrees; e = 0.235; K = 16.87 km/s; V-0 = -20.12 km/s; a(1)sini = 75.67 Gm; f(M) = 0.154 M.. The spectral type of the primary, and the f(M) value, lead to M(2) greater than or equal to 1.0 +/- 0.2 M. for the mass of the unseen companion. According to the color indices B - V and U - B of the system, the secondary star should be a F5V. We estimate at 1.25 +/- 0.1 UA the mean linear separation of the components; nevertheless, both the distance of this binary (d similar to 275 pc) and the expected value of am seem too important for the system to be resolved by interferometry.