THIRD COMPONENT IN ALGOL TYPE ECLIPSING BINARY SYSTEMS

After the application of the echelle spectrograph in combinations with high sensitivity radiation receivers during the observations of short period Algol type binary star systems, in some cases there is a special feature observed in their spectrum which could indicate the presence of the potential third component. Currently the subclass of the star is distinguished among the Algol type stars in spectra of which similar features have been observed. The results of the spectral observations of two Algol type stars that belong to the subclass δ Lib and U Sge are also included. In both stars, there is an absorption detail that appears during the phases of the orbit (0.1 – 0.4) in red and (0.6 – 0.8) in blue wings of the Hα line. These phase intervals correspond to eclipse period of the secondary component. Preliminarily, we are suggesting that this observational fact could indicate the presence of the third component in the system and also provides alternative hypotheses that leads to similar physical conditions.