W. J. Maciel,1 R. D. D. Costa,1 and O. Cavichia2
1 Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo - Rua do Matão 1226, CEP 05508-090, São Paulo SP, Brazil. (wjmaciel@iag.usp.br, roberto.costa@iag.usp.br).
2 Instituto de Física e Química, Universidade Federal de Itajubá, Av. BPS 1303, Pinheirinho, CEP 37500-903, Itajubá, MG, Brazil. (cavichia@unifei.edu.br).
Received, December 18 2014.
Accepted March 9 2015.
RESUMEN
Investigamos las variaciones de los gradientes radiales de abundancia de O/H de nebulosas planetarias (PN) situadas a diferentes distancias del plano galáctico. En particular, determinamos los gradientes de abundancia a diferentes alturas del plano con el fin de investigar una posible inversión del gradiente en los objetos más distantes. Consideramos una amplia muestra de PN con distancias conocidas para así poder derivar la altura relativa al plano galáctico, así como las abundancias exactas, que son necesarias para determinar los gradientes.
ABSTRACT
We studied the variations of the radial O/H abundance gradients from planetary nebulae (PN) located at different distances from the galactic plane. In particular, we determined the abundance gradients at different heights from the plane in order to investigate a possible gradient inversion for the objects at larger distances from the plane. We considered a large sample of PN with known distances, so that the height relative to the galactic plane can be obtained and with accurate abundances, so that the abundance gradients can be determined.
Key Words: Galaxy: abundances — Galaxy: disk — ISM: abundances — planetary nebulae: general.
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