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The Magellanic Clouds and the Primordial Helium Abundance

Published online by Cambridge University Press:  25 May 2016

Manuel Peimbert  and
Antonio Peimbert
Manuel Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autonoma de México. Apdo. Postal 70-264, Mexico, D.F. 04510
Antonio Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autonoma de México. Apdo. Postal 70-264, Mexico, D.F. 04510

Abstract

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A new determination of the pregalactic helium abundance based on the Magellanic Clouds H II regions is discussed. This determination amounts to Y p = 0.2345 ± 0.0030 and is compared with those derived from giant extragalactic H II regions in systems with extremely low heavy elements content. It is suggested that the higher primordial value derived by other authors from giant H II region complexes could be due to two systematic effects: the presence of neutral hydrogen inside the helium Strömgren sphere and the presence of temperature variations inside the observed volume.

Information

Type
3. Abundances of D, 3He and 4He
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 194 - 203
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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