MODEL-FITTING AND ERROR ANALYSIS FOR DIFFERENTIAL INTERFEROMETRY .2. APPLICATION TO ROTATING STARS AND BINARY-SYSTEMS

A combination between high angular and high spectral resolution techni ques, Differential Interferometry (DI) yields seeing independent infor mation with a resolution eventually much higher than the telescope dif fraction limit. A first paper presented a formalism for the estimation of the parameters modelling the brightness and velocity distribution of any astronomical candidate, even partially resolved. Here we descri be the application of this general method to the measurement of the an gular diameters, rotation velocities and position angles of the rotati on axes of rotating stars and to the measurement of the angular vector ial separation and radial velocity differences in binary systems. A me thod to compute the uncertainties on this parameters is presented and used for a numerical computation of the limiting performances of DI fo r this two kinds of applications.