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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 Yp = 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.

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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