Abstract
Stellar evolution considerations are of fundamental importance in our understanding of the axion/ALP-photon coupling, g_{aγ}. Helium burning stars are the best laboratories to study this coupling. Here, we will review the bounds from massive and low mass helium burning stars, and present a new analysis of the bound from the horizontal branch stars. The analysis provides the strongest bound to date on g_{aγ} in a wide mass range.
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