Dr. Gloria Delgado, UNAM
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Abstract: Planetary nebulae are the gas and dust remnants of low- and intermediate-mass stars. The chemical abundance of the nebular gas provide us information about nucleosynthesis and mixing in the progenitor star (e.g., He, C, and N abundances) and also about the chemical composition of the cloud from which the progenitor star formed (e.g., Ar and Cl abundances). For this reason, PNe are widely used to study how low- and intermediate-mass stars enrich the interstellar medium and, together with H II regions, to learn about chemical enrichment of galaxies. In addition, the progenitor stars of PNe are efficient sources of dust and thus, we can learn about dust evolution in circumstellar envelopes by studying the grain chemistry and element depletions in PNe. In this talk, I will present some relevant results derived from the analysis of the gas and dust in PNe