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Primordial helium abundance of the SMC: a view from intermediate mass stars

Published online by Cambridge University Press:  23 April 2010

Roberto D. D. Costa ,
Walter J. Maciel  and
Thais E. P. Idiart
Roberto D. D. Costa
Affiliation:
IAG, University of São Paulo, Rua do Matão 1226, 05508-090, São Paulo/SP, Brazil email: roberto@astro.iag.usp.br, maciel@astro.iag.usp.br, thais@astro.iag.usp.br
Walter J. Maciel
Affiliation:
IAG, University of São Paulo, Rua do Matão 1226, 05508-090, São Paulo/SP, Brazil email: roberto@astro.iag.usp.br, maciel@astro.iag.usp.br, thais@astro.iag.usp.br
Thais E. P. Idiart
Affiliation:
IAG, University of São Paulo, Rua do Matão 1226, 05508-090, São Paulo/SP, Brazil email: roberto@astro.iag.usp.br, maciel@astro.iag.usp.br, thais@astro.iag.usp.br
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Abstract

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Helium abundances were derived for a sample of planetary nebulae of the Small Magellanic Cloud. These abundances were corrected from the chemical evolution of the galaxy as well as from stellar nucleosynthesis, and the primordial helium abundance then was estimated for the sample. Results indicate that the resulting average value for the sample is consistent with the expected values for primordial helium from SBBN and other values derived from HII regions in different stellar systems, even varying the enrichment ratio within its uncertainty range.

Keywords

ISM: planetary nebulaestars: abundancesgalaxies: Magellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 173 - 174
Copyright
Copyright © International Astronomical Union 2010

References

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