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... We confirm the well-established differences for [$\alpha$/Fe] at a givenmetallicity between the local thin and thick disks. For all the elementsinvestigated, we find no chemical distinction between the bulge and the localthick disk, in agreement with our previous study of C, N and O but in contrastto other groups relying on literature values for nearby disk dwarf stars. For-1.5 < [Fe/H] < -0.3 exactly the same trend is followed by both the bulge andthick disk stars, with a star-to-star scatter of only 0.03 dex. Furthermore,both populations share the location of the knee in the [alpha/Fe] vs [Fe/H]diagram. It still remains to be confirmed that the local thick disk extends tosuper-solar metallicities as is the case for the bulge. These are the moststringent constraints to date on the chemical similarity of these stellarpopulations. Our findings suggest that the bulge and local thick disk starsexperienced similar formation timescales, star formation rates and initial massfunctions, confirming thus the main outcomes of our previous homogeneousanalysis of [O/Fe] from infrared spectra for nearly the same sample. Theidentical alpha-enhancements of thick disk and bulge stars may reflect a rapidchemical evolution taking place before the bulge and thick disk structures wesee today were formed, or it may reflect Galactic orbital migration of innerdisk/bulge stars resulting in stars in the solar neighborhood with thick-diskkinematics.

Chemical similarities between Galactic bulge and local thick disk red giants: O, Na, Mg, Al, Si, Ca and Ti