Hostname: page-component-8448b6f56d-gtxcr Total loading time: 0 Render date: 2024-04-19T12:10:13.672Z Has data issue: false hasContentIssue false
  • English
  • Français

Planetary Nebulae and the Pregalactic Helium Abundance

Published online by Cambridge University Press:  19 July 2016

Walter J. Maciel
Walter J. Maciel*
Affiliation:
Instituto Astronômico e Geofísico da USP, Caixa Postal 30.627, 01051 São Paulo SP, Brasil

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Recent work has emphasized the determination of the pregalactic helium abundance by mass Yp and the slope ΔY/ΔZ based on the chemical composition of both galactic and extragalactic H II regions (Pagel, 1987; Pagel et al., 1986).

Type
II. Nebular Properties
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 213
Copyright
Copyright © Kluwer 1989 

References

Faúndez-Abans, M., Maciel, W. J. 1986, Astron. Astrophys. 158, 228 Google Scholar
Faúndez-Abans, M., Maciel, W. J. 1987, Astron. Astrophys. (in press) Google Scholar
Maciel, W. J. 1987, Late Stages of Stellar Evolution, eds. Kwok, S., Pottasch, S. R., Reidel, p. 391 CrossRefGoogle Scholar
Maciel, W. J., Faúndez-Abans, M. 1985, Astron. Astrophys. 149, 365 Google Scholar
Pagel, B. E. J. 1987, preprint Google Scholar
Pagel, B. E. J., Terlevich, R. J., Melnick, J. 1986, PASP 98, 1005 CrossRefGoogle Scholar
Peimbert, M. 1983, Primordial Helium, eds. Shaver, P. A., Kunth, D., Kjar, K., ESO, p. 267 Google Scholar
Peimbert, M. 1986, PASP 98, 1057 CrossRefGoogle Scholar