Estimate of the spectral classes of the T Tau type stars HL Tau and DG Tau

Estimates have been made of the fundamental physical characteristics of two stars in the stage of evolution to the main sequence. The revised spectral classification for the star HL Tau has made it possible to achieve agreement with the published physical characteristics. The results of the estimates by two independent methods of the fundamental physical characteristics of the two stars in the stage of evolution to the main sequence have given consistent results. For the star HL Tau the revised spectral classification has made it possible to establish agreement for the published physical characteristics of the star. It is probable that HL Tau is a star of early spectral class and of the Ae/Be Herbig type