# metadata.dc.description.abstract[].value
Hydrodynamical equations act as a link between the local observed magnitudes of galactic motion and the general ones accounting for the behaviour of the Galaxy as a whole. Constraints are set usually in order to use them even in the lower order hierarchy. The authors present in this paper the complete expressions up to their fourth order. These equations will be used in the next future in their general form taking into account both the expected increase of kinematic data that the astrometric mission Hipparcos will provide, and some recent results indicating the possibility to obtain estimates for the momenta gradients.

# metadata.dc.relation.isformatof[].value
Reproducció digital del document publicat en format paper, proporcionada per NASA Astrophysics Data System http://adsabs.harvard.edu/

# metadata.dc.relation.ispartof[].value
Astronomy and Astrophysics Supplement Series, 1985, vol. 62, p. 321-338.

# metadata.dc.rights[].value
(c) The European Southern Observatory, 1985

# metadata.dc.source[].value
Articles publicats en revistes (Física Quàntica i Astrofísica)