1999A&A...347..932B

New high-resolution and high signal-to-noise ratio spectroscopic observations carried out in 1996-1997 are analysed. A total of 85 new high quality radial velocity measurements are used for determining the new orbital parameters: T_conj=HJD2450342.883+24.64880E, e=0.0, γ=-14.09km/s, K₁=34.39km/s. A model atmosphere analysis of the averaged spectrum of the star has yielded a self-consistent set of fundamental parameters of the primary component: T_eff=4450K, logg=2.4, [M/H]=0.0, ξ_t=1.6km/s, vsini=26.5km/s. The primary is found to be a typical K2 III giant with the mass of about 1.5M_☉ which has undergone the first convective mixing on the Red Giant Branch ([C/H]=-0.32, [N/H]=0.30, C/N=1.15). The unspotted V magnitude of the star of 5.55mag is estimated from the observed variations of the TiO band and quasi-simultaneous photometry. Combining all parameters, the radius and inclination of the primary as well as a probable spectral class of the secondary are estimated.