ИСТИНА

Due to that Hydrogen is the most abundant element of the Universe, relatively easily excited by radiation and electron collisions, hydrogen lines are the most intense in the emission spectra of very different astrophysical objects. So, the hydrogen lines play an important role for diagnostic and modeling of emission regions. In recent years due to the rapid development of infrared astronomy the lines of higher hydrogen series added to the Balmer-lines. After the short review of the published results of the calculations we present the calculations of relative intensities of lines belonging to Paschen, Bracket and Pfund series. They can be used both for diagnostic emitting regions, and for determining the extinction objects with strong absorption.