An estimate of the time variation of the abundance gradient from planetary nebulae III. O, S, Ar, and Ne: A comparison of PN samples

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dc.creatorMaciel, W. J.
dc.creatorLago, L. G.
dc.creatorCosta, R. D. D.
dc.date2006-03-16
dc.date.accessioned2026-07-07T07:01:10Z
dc.date.available2026-07-07T07:01:10Z
dc.descriptionThe 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, homogeneous sets of data, and larger, albeit non-homogeneous samples. Four different chemical elements are considered, namely, oxygen, sulphur, argon and neon. Our analysis support our earlier conclusions that, on the average, the radial abundance gradients have flattened out in the last 6 to 8 Gyr.
dc.description10 pages, 10 encapsulated postscript figures, LaTeX, uses Astronomy and Astrophysics macro aa.cls, graphicx package, accepted for publication in Astronomy and Astrophysics, Also available at: http://www.astro.iag.usp.br/~maciel
dc.identifierhttps://arxiv.org/abs/astro-ph/0603419
dc.identifierhttp://arxiv.org/abs/astro-ph/0603419
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/108192
dc.subjectAstrophysics
dc.titleAn estimate of the time variation of the abundance gradient from planetary nebulae III. O, S, Ar, and Ne: A comparison of PN samples
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