Evolution of the titanium and oxygen abundances from observations of FGK dwarfs in a wide metallicity range

For a sample of dwarf stars close to the Sun with well-known atmospheric parameters and an iron abundance in the range −2.6 −0.7, and the titanium overabundance relative to iron is 0.3. The results confirm that not only oxygen but also titanium are synthesized in the α-process. Our data can be used to test the Galactic chemical evolution models.