Young open star clusters: spatial distribution of metallicity in the vicinity of the Sun

We have fulfilled the comparative analysis of spatial distributions of young ($<50$ million years) open star clusters and field Cepheids of different metallicity. Both types of objects demonstrated significant heterogeneity of metallicity distributions, indicating weak mixing of interstellar matter at the time of their formation. Moreover, a significant difference of these distributions in open clusters and field stars suggested the difference of conditions required for the formation of these types of objects.