Evolución de estrellas enanas blancas ricas en metales

ROMERO, A. D.; PANEI, J. A.; ALTHAUS L. G.

San Juan, Argentina

Congreso; LI Reunión Anual de la Asociación Argentina de Astronomía; 2009

Asociación Argentina de Astronomía

Over the past years, low mass white dwarf (WD) stars were detected in metal-rich clusters, at very low luminosities, for example in NGC 6791. In order to obtain models appropriate to study this stars, we compute a set of helium WD evolutionary sequences with metallicity values of Z = 0.03, 0.04 and 0.05 for the progenitors, taking into account the evolution during the pre-WD stage. Particularly, we analyze the impactof residual hydrogen burning and chemical diffusion and gravitationalsettling in the WD evolution, specially in the cooling times.