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19992014
most citedUsing Cepheids to determine the galactic abundance gradient I. The solar neighbourhood

173 citations · 523 across the 7 of their papers we have counts for

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astro-ph2000★ 12 cited

Helium contamination from the progenitor stars of planetary nebulae: The He/H radial gradient and the Delta Y/Delta Z enrichment ratio

W. J. Maciel

In this work, two aspects of the chemical evolution of 4He in the Galaxy are considered on the basis of a sample of disk planetary nebulae (PN). First, an application of correction…