W. J. Maciel -
Abstract #41
METAL-POOR PLANETARY NEBULAE WITH LOW MASS CENTRAL STARS
W. J. Maciel, J. A. Freitas Pacheco, S. J. Codina-Landaberry
Astron. Astrophys. 239, 301-304 (1990) Some type II planetary nebulae (PN) present a strong underabundance in heavy element ratios such as O/H and S/H, as compared to most objects of this type at similar galactocentric distances. In this work, both published and new data on chemical abundances are taken into account in order to determine systematic composition differences for these objects. Estimates of the temperatures and luminosities of the central stars suggest that most of them are very low mass objects.
