Abstract
ABSTRACT:Planetary nebulae of types I, lIa, and llb are considered in order to determine the galactic rotation curve. It is shown that the curves defined by the first two types do not differ substantially from the one derived on the basis of young population I objects, such as CO-H II molecular complexes. RESUMO:Um grupo de nebulosas planetarias de tipos I, lIa, e lIb e utilizado para determinar a curva de rota o galatica. Mostra-se que as curvas definidas pelos dois primeiros tipos de nebulosas diferem substancialmente da curva obtida a partir de objetos jovens, de popuIa o I, como Os complexos moleculares CO-H II. Koy words: GALAXY-STRUCTURE - NEBULAE-PLANETARY
