An empirical calibration of the helium abundance in H <scp>ii</scp> regions based in literature and CALIFA survey data

Helium is the second most common chemical species in Universe. The study of helium abundance has potential to unravel evolution and within galaxies. In this study, we provide an empirical calibration for singly ionized abundance: $12+\log_{10}({\rm He}^+/{\rm H}^+)$, based on emission line flux ratio He$_{\lambda5876}$/H$\alpha$ from Galactic extragalactic HII regions compiled literature. Based calibrator, explore first time a large sample located galaxies representative nearby Universe CALIFA survey. Furthermore, calibrator allows us variations with respect oxygen abundance. observed trends are agreement change enrichment mass/oxygen similar one due inside-out model MW-galaxy (highlighting connection between resolved global galaxies). Our provides proxy estimate at kpc scales as well constrain evolutionary models.