PLANETARY NEBULAE IV PREDICTED CHEMICAL COMPOSITION AND INTERSTELLAR ENRICHMENT
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UNAM, Boletín de Observatorios Tonatzintla y Tacubaya, México.
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Abstract
For pt. III see abstr. A66513 of 1971. Based on stellar evolution models and on observations of planetary nebulae, the change of chemical abundances in the interstellar medium is studied. It is found that the contribution to the N/O abundance gradient pre