Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-22
Astronomy and Astrophysics
Astrophysics
17 pages, 3 figures, to appear in Revista Mexicana de Astronomia y Astrofisica. uses rmaa.cls, natbib.sty
Scientific paper
Recent investigations on the central stars of planetary nebulae (CSPN) indicate that the masses based on model atmospheres can be much larger than the masses derived from theoretical mass-luminosity relations. Also, the dispersion in the relation between the modified wind momentum and the luminosity depends on the mass spread of the CSPN, and is larger than observed in massive hot stars. Since the wind characteristics probably depend on the metallicity, we analyze the effects on the modified wind momentum by considering the dispersion in this quantity caused by the stellar metallicity. Our CSPN masses are based on a relation between the core mass and the nebular abundances. We conclude that these masses agree with the known mass distribution both for CSPN and white dwarfs, and that the spread in the modified wind momentum can be explained by the observed metallicity variations.
Costa Roberto D. D.
Keller George Randy
Maciel Walter J.
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