Contribution à l'étude des binaires des types F, G, K, M

VIII. HD 195850 et HD 201193, binaires spectroscopiques à raies doubles Contribution to the study of F, G, K, M binaries. VIII. HD 195850 and HD 201193, double-lined spectroscopic binaries

Observatoire Midi-Pyrénées, Laboratoire d'astrophysique (UMR 5572), 14 avenue Édouard Belin, F-31400 Toulouse, FranceÉtude basée sur des observations effectuées à l'Observatoire de Haute-Provence, France.

Received: 21 February 2000
Accepted: 23 March 2000

Abstract

Radial-velocity observations of the double-lined spectroscopic binaries HD 195850 and HD 201193 have been carried out at the Observatoire de Haute-Provence with the CORAVEL instrument in order to determine their orbital elements. They are as follows HD 195850: days; HJD; ; ;  km s^-1;  km s^-1;  Km s^-1;  Gm;  Gm; ; . HD 201193:  days;  HJD; ; ;  km s^-1;  km s^-1;  km s^-1;  Gm;  Gm; ; . For HD 195850, we propose a F5V + G2V model on the basis of both the Hipparcos-measured parallax and the value, 1.1 mag, deduced from the intensities of the correlation dips. HD 201193, for its part, is formed by two quasi-identical F6V stars. Strömgren photometric indices suggest the following physical parameters: M_v = 3.6 ;  K; . Using Schaller et al. (1992) evolutionary tracks for stars of solar metallicity, we estimate for the mass of each component. This system should be somewhat evolved above the ZAMS, and the possibility of eclipses is, a priori, not excluded; it is likely that the components rotate in synchronism with the orbital motion.