Abstract
Abstract We propose a new method for the determination of the rotation velocity of the Galactic spiral density waves, respectively the corotation radius, rC, in our Galaxy by means of a statistical analysis of the radial distribution of oxygen in the Galactic disc, derived over Cepheids. The corotation resonance happens to be located at rC∼ 7.0–7.6 kpc, depending on the rate of gas infall on to the Galactic disc, the statistical error being ∼0.3–0.4 kpc. Simultaneously, the constant for the rate of oxygen synthesis in the Galactic disc is determined. We also argue in favour of very short time-scale formation of the Galactic disc, namely tf∼ 2 Gyr. This scenario enables us to solve the problem of the lack of intergalactic gas infall.
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