Velocity curve analysis of spectroscopic binary stars EQ Tau, .V376 And, V776Cas, V2377 Oph and V380 Cygni by nonlinear regression

Using measured radial velocity data of five double-lined spectroscopic binary systems eq tau, v376 and, v776 cas, v2377 ophand v380 cygni, we find corresponding orbital and spectroscopic elements via the method introduced by karami & teimoorinia andkarami & mohebi. our numerical results are in good agreement with those obtained by others using more traditional methods.