Abstract:
Places of formation of 19 nearby classical Cepheids have been computed in a model of our Galaxy which has axisymmetric and spiral-like components. For the axisymmetric component Schmidt’s (1965) model is used, and spsiral-like perturbations are approximated by logarithmic spirals. Different pattern speeds, Ωp, have been used to get the best correlation of places of formation with a spiral structure. We conclude that best fit is obtained with Ωp = 13.5 km s-¹ kpc-¹.
