68 citations · 187 across the 10 of their papers we have counts for
3 papers · 1 filter
Metallicity effects on the modified wind momentum of CSPN
W. J. Maciel, G. R. Keller, R. D. D. Costa
Recent investigations on the central stars of planetary nebulae (CSPN) indicate that the masses based on model atmospheres can be much larger than the masses derived from theoretic…
New results on the time variation of the radial abundance gradients from planetary nebulae
W. J. Maciel, L. G. Lago, R. D. D. Costa
New results on the time variation of the radial abundance gradients in the galactic disk are presented on the basis of four different samples of planetary nebulae. These comprise b…
Chemical abundances of planetary nebulae towards the direction of the galactic anticenter
R. D. D. Costa, M. M. M. Uchida, W. J. Maciel
In this paper we report new observations and derive chemical abundances for a sample of 26 planetary nebulae (PN) located in the anticenter direction. Most of these nebulae are far…