Abstract
The star alpha Vir is a well known double-lined spectroscopic binary with a B-type for both components. In the present paper we have analyzed a total of 90 spectra obtained through 1992-2000. Spectral analysis are based on two spectral lines H-alpha and HeI6678 angstrom belong to H-alpha region. Radial velocity analysis have suggested low eccentric orbit (e=0.002) at inclination (i = 81 degrees.89 +/- 2 degrees.3 4) and with 4(d) .01422 period, semi-amplitude k(1) = 100 km/s, mass ratio q = 0.4 9 +/- 0.05 and mass function f (m) = 0.547. Using KOREL program for spectrum disentangling we have been able to decompose the spectrum of the system to its primary and secondary components. Synthetic spectral analysis of both the individual and disentangled spectra has been performed and yielded effective temperatures T-eff = 25000 +/- 250 K, surface gravities logg = 3.75 +/- 0.25 and projected rotational velocities (v sin i = 180 +/- 5 km/s) for the primary, while for the secondary they are T-eff = 17000 +/- 250 K, log g = 4.0 +/- 0.25.