Abundances of α elements as a function RG. Cepheid stars (filled circles) are compared with RSGs in the Galactic center analyzed by Davies et al. (2009a, D09a, cyan triangles), RSGs in the Scutum cluster analyzed by Davies et al. (2009b, D09b, magenta diamonds) and by Origlia et al. (2013, O13, yellow open circles), and with the mean abundance of two luminous blue variables (LBVs) in the Quintuplet cluster measured by Najarro et al. (2009, N09, red asterisk). The radial gradients derived by Mikolaitis et al. (2014, M14) for thin (solid line) and thick (dotted line) disk stars in the Gaia-ESO survey are also shown.
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