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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

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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

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Pagel, B. E. J. 1987, preprint Google Scholar
Pagel, B. E. J., Terlevich, R. J., Melnick, J. 1986, PASP 98, 1005 CrossRefGoogle Scholar
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