ИСТИНА

We present a new technique implemented in IDL for determination of the parameters of the stellar atmospheres, based on PHOENIX and BT-Settl synthetic stellar spectra. The synthetic spectra provide wide coverage in the Teff, logg, [Fe/H], [α/H] parameter space over a wide wavelength range and allow to fit observed spectra of a vast majority of stars. Our procedure also determines radial velocities and star rotation rates, and it takes into account flux calibration imperfections by fitting a polynomial continuum. We can also exclude certain spectral features, which are not included in the models, such as emission lines (chromospheric emission in late-type stars or discs around Be stars). We perform the non-linear chi2 minimization with the Lavenberg-Marquardt method that is applied to the entire spectrum, with the exception of areas with peculiarities: emission lines, model shortcomings (incompleteness of the list of spectral lines for model calculation). The main advantage of our technique is the physically reasonable calibration of stellar atmospheric parameters. We present the comparative statistical analysis with spectral libraries ELODIE, INDO-US, MILES, UVES-POP and discuss prospective applications of our technique.