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A minor population of antistars in galaxies has been predicted by some ofnon-standard models of baryogenesis and nucleosynthesis in the early Universe,and their presence is not yet excluded by the currently available observations.Detection of an unusually high abundance of antinuclei in cosmic rays can probethe baryogenesis scenarios in the early Universe. Recent report of the\textit{AMS-02} collaboration on the tentative detection of a few antiheliumnuclei in GeV cosmic rays provided a great hope on the progress in this issue.We discuss possible sources of antinuclei in cosmic rays from antistars whichare predicted in a modified Affleck-Dine baryogenesis scenario by Dolgov andSilk (1993). The model allows us to estimate the expected fluxes and isotopiccontent of antinuclei in the GeV cosmic rays produced in scenarios involvingantistars. We show that the flux of antihelium CRs reported by the\textit{AMS-02} experiment can be explained by Galactic anti-nova outbursts,thermonuclear anti-SN Ia explosions, a collection of flaring antistars or anextragalactic source with abundances not violating existing gamma-ray andmicrolensing constraints on the antistar population.

Antistars as possible sources of antihelium cosmic rays