Abstract
A review on ΔY/ΔZ and ΔY/ΔO determinations is presented. Results based on galactic and extragalactic gaseous nebulae are analyzed. The temperature structure of the gaseous nebulae is taken into account as well as the fraction of O atoms tied up in dust grains. The best galactic and extragalactic determinations of ΔY/ΔO are compared with chemical evolution models of the solar vicinity and of metal poor galaxies. The relevance of this comparison to the presence of: black holes, different types of galactic outflows and temperature inhomogeneities in H II regions is discussed.
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Peimbert, M. (1995). The Helium to Heavy Elements Enrichment Ratio. In: Crane, P. (eds) The Light Element Abundances. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-49169-9_24
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DOI: https://doi.org/10.1007/978-3-540-49169-9_24
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