The bulk of 12C production in the Universe is produced through the triple alpha process. The possible variation of the fine structure constant affects the 3alpha reaction rate and subsequently the 12C nucleosynthesis. Massive primordial stars rely on the production of 12C at the beginning of their evolution because it triggers the CNO-cycle that provides the energy release they need to counteract gravitation. We may thus put constraints on the possible variations of the constant by implementing the modified 3alpha rates in stellar evolution models of Pop III stars. We present here the results of these stellar models and their consequences on different astrophysical parameters.
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