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Some aspects of the chemical evolution of 4He in the Galaxy: the He/H radial gradient and the ΔY/ΔZ enrichment ratio

Published online by Cambridge University Press:  25 May 2016

W. J. Maciel
W. J. Maciel*
Affiliation:
IAG/USP - Av. Miguel Stefano 4200 - CEP 04301-904 Sao Paulo SP, Brazil

Abstract

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Two aspects of the chemical evolution of 4He in the Galaxy are considered on the basis of a sample of disk planetary nebulae by the application of corrections due to the contamination of 4He from the progenitor stars. First, the He/H radial gradient is analyzed, and then, the helium to heavy element enrichment ratio is determined for metallicities up to the solar value.

Type
3. Abundances of D, 3He and 4He
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 204 - 213
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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