35 citations · 48 across the 7 of their papers we have counts for
7 papers
Improving the determination of chemical abundances in planetary nebulae
O. Cavichia, R. D. D. Costa, W. J. Maciel +1
Planetary nebulae are the products of the evolution of low and intermediate mass stars. The chemical property studies of these objects give important information about the elementa…
Li-rich AGB/RGB stars: Lithium abundances and mass loss
W. J. Maciel, R. D. D. Costa
Most metal-rich AGB/RGB stars present strong Li underabundances, since this element is easily destroyed in the high temperatures of the stellar interiors. In spite of this fact, se…
Symmetric vs. asymmetric planetary nebulae: morphology and chemical abundances
W. J. Maciel, R. D. D. Costa
We analyse a large sample of galactic planetary nebulae based on their chemical composition and morphology. A recent morphological classification system is adopted, and several ele…
Planetary nebulae in the inner Milky Way
O. Cavichia, R. D. D. Costa, W. J. Maciel
New abundances of planetary nebulae located towards the bulge of the Galaxy are derived based on observations made at LNA (Brazil). We present accurate abundances of the elements H…
Chemical evolution of the galactic bulge: single and double infall models
R. D. D. Costa, W. J. Maciel, A. V. Escudero
Recent work has produced a wealth of data concerning the chemical evolution of the galactic bulge, both for stars and nebulae. Present theoretical models generally adopt a limited…
Chemical evolution of the Small Magellanic Cloud based on planetary nebulae
T. P. Idiart, W. J. Maciel, R. D. D. Costa
We investigate the chemical evolution of the Small Magellanic Cloud (SMC) based on abundance data of planetary nebulae (PNe). The main goal is to investigate the time evolution of…