25 citations · 25 across the 2 of their papers we have counts for
2 papers
astro-ph.SR2011
Kinematic ages of central stars of planetary nebulae
W. J. Maciel, T. S. Rodrigues, R. D. D. Costa
The age distribution of the central stars of planetary nebulae (CSPN) is estimated using two methods based on their kinematic properties. First, the expected rotation velocities of…
astro-ph2007★ 25 cited
Time variation of radial gradients in the galactic disk: electron temperatures and abundances
W. J. Maciel, C. Quireza, R. D. D. Costa
We investigate the electron temperature gradient in the galactic disk as measured by young HII regions on the basis of radio recombination lines and the corresponding gradient in p…