Planetary Nebulae as a Chemical Evolution Tool: Abundance Gradients

Details Planetary Nebulae as a Chemical Evolution Tool: Abundance Gradients Planetary Nebulae as a Chemical Evolution Tool: Abundance Gradients

2005-09-02

arxiv.org/abs/astro-ph/0509044v1

AIP Conf.Proc.804:246-249,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to appear in the proceedings of the conference "Planetary Nebulae as astronomical tools", Gdansk, Poland, j

Scientific paper

10.1063/1.2146285

We have studied the time variation of the radial abundance gradients using samples of planetary nebulae, open clusters, cepheids and other young objects. Based on the analysis of O/H and S/H abundances for planetary nebulae and metallicities of the remaining objects, we concluded that the gradients have been flattening out in the last 8 Gyr with an average rate of the order of 0.005 - 0.010 dex/(kpc Gyr). We have estimated the errors involved in the determination of the gradients, and concluded that the existence of systematic abundance variations is more likely than a simple statistical dispersion around a mean value.

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