New results on the time variation of the radial abundance gradients from planetary nebulae

Details New results on the time variation of the radial abundance gradients from planetary nebulae New results on the time variation of the radial abundance gradients from planetary nebulae

2006-05-02

arxiv.org/abs/astro-ph/0605074v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, LaTeX, To be published in the Proceedings of the IAU Symposium 234: Planetary Nebulae in Our Galaxy and Bey

Scientific paper

10.1051/0004-6361:20054557

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 both smaller, homogeneous sets of data, and larger but non-homogeneous samples. Four different chemical elements are considered, namely, O, S, Ar, and Ne. Other objects such as open clusters, cepheids and HII regions are also taken into account. Our analysis support our earlier conclusions in the sense that, on the average, the radial abundance gradients have flattened out during the last 6 to 8 Gyr, with important consequences for models of the chemical evolution of the Galaxy.

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