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The Helium-to-Metals Enrichment Ratio in Planetary Nebulae

Published online by Cambridge University Press:  07 August 2017

C.M.L. Chiappini  and
W.J. Maciel
C.M.L. Chiappini
Affiliation:
Instituto Astronômico e Geofísico da USP, Av. Miguel Stefano 4200, 04301-904 SÃo Paulo SP, Brazil
W.J. Maciel
Affiliation:
Instituto Astronômico e Geofísico da USP, Av. Miguel Stefano 4200, 04301-904 SÃo Paulo SP, Brazil

Extract

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The helium-to-metals enrichment ratio (dY/dZ) and the pregalactic helium abundance (Yp) are important parameters for the understanding of the galactic chemical evolution, and also as a cosmological test to the Big Bang theory. In this work, we present a new determination of these parameters based on a sample of galactic HII regions, HII galaxies, and planetary nebulae.

Type
VI. Planetary Nebulae in Galactic Systems
Information
Symposium - International Astronomical Union , Volume 155: Planetary Nebulae , 1993 , pp. 583
Copyright
Copyright © Kluwer 1993