Chemical abundances of planetary nebulae towards the Galactic anticenter

Free access article

Issue		A&A Volume 423, Number 1, August III 2004


Page(s)		199 - 207
Section		Interstellar and circumstellar matter
DOI		http://dx.doi.org/10.1051/0004-6361:20034539

A&A 423, 199-207 (2004)
DOI: 10.1051/0004-6361:20034539

Chemical abundances of planetary nebulae towards the Galactic anticenter

R. D. D. Costa, M. M. M. Uchida and W. J. Maciel

Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG), Universidade de São Paulo, Rua do Matão 1226, 05508-900, São Paulo SP, Brazil
e-mail: [roberto;monica;maciel]@astro.iag.usp.br

(Received 20 October 2003 / Accepted 24 April 2004 )

Abstract
In this paper we report new observations and derive chemical abundances for a sample of 26 planetary nebulae (PN) located in the anticenter direction. Most of these nebulae are far away objects, located at Galactocentric distances greater than about 8 kpc, so that they are particularly useful for the determination of the radial gradients at large distances from the galactic center. A comparison of the present results with previously determined abundances suggests that the radial abundance gradients flatten out at distances larger than about 10 kpc from the center.

Key words: ISM: planetary nebulae: general -- Galaxy: disk -- ISM: abundances

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