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4He abundances: Optical versus radio recombination line measurements

Published online by Cambridge University Press:  23 April 2010

Dana S. Balser ,
Robert T. Rood  and
T. M. Bania
Dana S. Balser
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903-2475USA email: [email protected]
Robert T. Rood
Affiliation:
Astronomy Department, University of Virginia, P.O.Box 3818, Charlottesville VA 22903-0818, USA email: [email protected]
T. M. Bania
Affiliation:
Institute for Astrophysical Research, 725 Commonwealth Avenue, Boston University, Boston MA 02215, USA email: [email protected]
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Abstract

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Accurate measurements of the 4He/H abundance ratio are important in constraining Big Bang nucleosynthesis, models of stellar and Galactic evolution, and H ii region physics. We discuss observations of radio recombination lines using the Green Bank Telescope toward a small sample of H ii regions and planetary nebulae. We report 4He/H abundance ratio differences as high as 15–20% between optical and ratio data that are difficult to reconcile. Using the H ii regions S206 and M17 we determine 4He production in the Galaxy to be dY/dZ = 1.71 ± 0.86.

Keywords

Galaxy: abundancesISM: planetary nebulaeH ii regionsradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 101 - 106
Copyright
Copyright © International Astronomical Union 2010

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