W. J. Maciel -
Abstract #112
STELLAR WINDS FROM CENTRAL STARS OF PLANETARY NEBULAE: METALLICTY EFFECTS
W. J. Maciel, R. D. D. Costa
Mass loss from stars and the evolution of stellar clusters, ed. A. de Koter, L. Smith, L. B. F. M. Waters, ASP vol. 388, 197-198(2008) Radiative wind theory applied to hot stars and central stars of planetary nebulae (CSPN) predicts a dependence of observed wind properties, such as the modified wind momentum, with basic stellar parameters, such as the stellar luminosity. Also, some dependence of this quantity is expected with the stellar metallicity, in view of the fact that the driving mechanism of the wind involves absorption lines of heavy elements. On the other hand, the mass-luminosity relation as applied to these stars shows some discrepancies when derived from either recent improved model atmospheres or evolutionary tracks for post-AGB stars. In this work, we analyze the metallicity effects on the modified wind momentum for CSPN by considering the expected dispersion in this quantity caused by the metallicity range of the CSPN. Also, the mass-luminosity relation of these stars is investigated on the basis of a recently proposed relation between the core mass of planetary nebulae and the observed nebular abundances. The IAG/USP database on the chemical abundances is used as well as observed wind characteristics of the central stars.
