Abstract
ABSTRACT: A sample containing 58 objects comprising blue compact galaxies, galactic H II regions, and planetary nebulae is considered in order to determine the pregalactic helium abundance Yp and the enrichment ratio of helium relative to heavy elements Ay/Az. RESUMO: Neste trabalho, e considerada uma amostra contendo 58 objetos, incluindo galaxias compactas azuis, regioes H II galaticas e nebulosas planetarias, com o objetivo de determinar a pregalatica de helio Yp e a razao de enriquecimento entre helio e elementos pesados, AY/Az. Key words: INTERSTELLAR-ABUNDANCES
