Chemical Analysis of B stars within 9—11 kpc from the Galactic Center

Radial gradients of metallicity are supported by observations of different young objects in the Galactic thin disk. The shape of the abundance distributions, however, is not completely constrained. Some works describe the abundance distributions as a function of the Galactocentric distance Rg by linear fits with a single slope. On the other hand some analyses of open clusters, cepheids and OB stars suggest a discontinuity in the abundance distributions around Rg =10 kpc. In this work we analyse a sample of 13 B stars members of four open clusters located within Rg =9-11 kpc in order to better constrain the chemical distribution in this region of the disk.