Dust and Obscuration in the Milky Way

Niels Bohr Institute for Astronomy, Geophysics and Physics, Juliane Maries Vej 30, 2100 Kǿbenhavn Ǿ, Denmark

Abstract

A detailed knowledge about the galactic extinction is mandatory to obtain the astrophysical/kinematical parameters time variation outside the solar neighbourhood. One may hope that the GAIA photometry itself will contribute to colour excess determinations for most of the sample otherwise the extinction must be deduced from external sources. 3D galactic models where the dust distribution is an integral part seems a viable solution.