Manchado, A.; Mampaso, A.; Pottasch, S. R.
Referencia bibliográfica
(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Phenomena in Galaxies, Puerto de la Cruz, Spain, July 4-15, 1988) Astrophysics and Space Science (ISSN 0004-640X), vol. 157, no. 1-2, July 1989, p. 23-29.
Fecha de publicación:
7
1989
Número de citas
5
Número de citas referidas
5
Descripción
Via optical low-resolution long slit spectroscopy conducted at the 2.5 m
INT in La Palma, He, O, N, Ne, A, and S abundances in 13 extended PN
were calculated. The analysis of these results made it possible to infer
that the nitrogen and oxygen abundances do not correlate, which implies
that probably not all the nitrogen found was produced in the CNO cycle.
Furthermore, the oxygen and neon abundances seem to correlate well
enough, indicating a common origin of these two elements during stellar
evolution. The values of He, O, N, and Ne abundances obtained, yield a
gradient of those abundances with the position of the nebulae with
respect to the galactic plane. This is consistent with the existence of
different types of populations among the PN in the Galaxy.