102 citations · 187 across the 4 of their papers we have counts for
4 papers
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…
Evolution from AGB to planetary nebula in the MSX survey
R. Ortiz, S. Lorenz-Martins, W. J. Maciel +1
We investigate the evolution of oxygen- and carbon-rich AGB stars, post-AGB objects, and planetary nebulae using data collected mainly from the MSX catalogue. Magnitudes and colour…
Chemical enrichment and star formation in the Milky Way disk; II. Star formation history
H. J. Rocha-Pinto, John Scalo, W. J. Maciel +1
A chromospheric age distribution of 552 late-type dwarfs is transformed into a star formation history by the application of scale height corrections, stellar evolutionary correctio…
Metallicity effects on the chromospheric activity-age relation for late-type dwarfs
H. J. Rocha-Pinto, W. J. Maciel
We show that there is a relationship between the age excess, defined as the difference between the stellar isochrone and chromospheric ages, and the metallicity as measured by the…