44 citations · 79 across the 2 of their papers we have counts for
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astro-ph2006★ 44 cited
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…
astro-ph2006★ 35 cited
An estimate of the time variation of the abundance gradient from planetary nebulae III. O, S, Ar, and Ne: A comparison of PN samples
W. J. Maciel, L. G. Lago, R. D. D. Costa
The time behaviour of the radial abundance gradients in the galactic disk is investigated on the basis of four different samples of planetary nebulae, comprising both smaller, homo…