O. Cavichia¹, R. D. D. Costa¹, and W. J. Maciel¹

¹ Departamento de Astronomia, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão, 1226, Cidade Universitaria, 05508–900 São Paulo–SP, Brazil. (cavichia@astro.iag.usp.br, roberto@astro.iag.usp.br, maciel@astro.iag.usp.br).

Received 2009 November 19
Accepted 2010 February 8

RESUMEN

Presentamos abundancias precisas de los elementos He, N, S, O, Ar, y Ne para una muestra de 54 nebulosas planetarias localizadas en la dirección del bulbo galáctico, para 33 de las cuales se presentan abundancias aquí por primera vez. Las abundancias se derivan a partir de observaciones en la región óptica hechas en el Laboratorio Nacional de Astrofísica (LNA), Brasil. Los datos muestran una buena concordancia con otros resultados en la literatura, en el sentido de que la distribución de abundancias es similar a la obtenida en otros trabajos.

ABSTRACT

The study of planetary nebulae in the inner–disk and bulge gives important information on the chemical abundances of elements such as He, N, O, Ar, Ne, and on the evolution of these abundances, which is associated with the evolution of intermediate–mass stars and the chemical evolution of the Galaxy.

We present accurate abundances of the elements He, N, S, O, Ar, and Ne for a sample of 54 planetary nebulae located towards the bulge of the Galaxy, for 33 of which the abundances are derived here for the first time. The abundances are obtained based on observations in the optical domain made at the National Laboratory for Astrophysics (LNA, Brazil). The data show a good agreement with other results in the literature, in the sense that the distribution of the abundances is similar to that of those works.

Key Words: Galaxy: abundances — Galaxy: evolution — planetary nebulae: general — techniques: spectroscopic.

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Part of this work was supported by the Brazilian agencies FAPESP and CNPq. O.C. would like to acknowledge FAPESP for his graduate fellowship (processes 05/03194–4 and 07/07704–2).

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