Constraint on the axion-electron coupling constant and the neutrino magnetic dipole moment by using the tip-RGB luminosity of fifty globular clusters
The current constraints in the neutrino magnetic dipole moment and axion-electron coupling constant ($\mathrm{μ_ν\leq2.2\times10^{-12}μ_{B}}$ and $\mathrm{α_{ae}\leq0.5\times10^{-26}}$) are tested against the observational calibration on the tip-RGB of fifty galactic globular clusters, covering $\mathrm{-1.95\leq[M/H]\leq+0.04}$. When each energy sink is introduced into stellar models separately, the current known constraints predict a tip-RGB bolometric luminosity that does not conflict the calibration, while when they are assumed to occur simultaneously, these constraints can be lowered down by 50\% and 75\%.
astro-ph.SR↗