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The comparative primary cosmic rays (PCR) comparative analysis by E0 and thespectra of variable stars by periods is carried out in order to establish thecauses of irregularities in the spectrum of PCR by E0. The relationship betweenthe periods of variable stars and the maximum energy E0 of the nuclei of PCRsgenerated by these types of stars is shown. Irregularities in the PCR spectrumby E0 are associated with the transition from one dominant stars type toanother. The knee in the PCR spectrum at E0 = 3-5 PeV is associated with adecrease in the contribution of SRB variability stars and a further increase inthe contribution of Mira variable stars to the PCR flux. The bump in the PCRspectrum with a maximum at E0 = 80 PeV is formed by giant stars andsuper-giants of the Mira and SRC variability.

Sources of primary cosmic rays forming the bump near E0=100 PeV