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Revista mexicana de astronomía y astrofísica
versión impresa ISSN 0185-1101
Rev. mex. astron. astrofis vol.46 no.1 Ciudad de México abr. 2010
Planetary nebulae in the inner Milky Way: new abundances
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, 05508900 São PauloSP, 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
El estudio de las nebulosas planetarias del disco interior y del bulbo galáctico proporciona importante información sobre las abundancias químicas de elementos como He, N, O, Ar, Ne y sobre la evolución de estas abundancias, la cual está asociada a la evolución de las estrellas de masa intermedia y a la evolución química de la Galaxia.
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 innerdisk 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 intermediatemass 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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ACKNOWLEDGES
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 05/031944 and 07/077042).
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