Quantitative Analysis of the Spectra of CQ Tau and UX Ori Stars Outside Eclipses According to the Nordic Optical Telescope Data

Abstract

A quantitative analysis of the spectra of CQ Tau and UX Ori stars belonging to the family of young irregular variable stars with Algol-like decrease in brightness has been performed. The spectra were obtained at the Nordic Optical Telescope (NOT) observatory at times when the stars were in a bright state. On their basis, the equivalent widths of the photospheric absorption lines, as well as the Hα emission line, are determined. The equivalent width of the latter is used to estimate the gas accretion rate on the stars.