What is 4He from H II regions? What needs to be done to better understand the systematic errors?

Details What is 4He from H II regions? What needs to be done to better understand the systematic errors? What is 4He from H II regions? What needs to be done to better understand the systematic errors?

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..268..163f&link_type=abstract

Light Elements in the Universe, Proceedings of the International Astronomical Union, IAU Symposium, Volume 268, p. 163-167

Mathematics

Logic

Ism: Abundances, Hii Regions, Galaxy: Abundances

Scientific paper

Here we summarize the discussion that took place after the presentation of papers discussing measurement of abundances from emission lines in H II regions. A cosmological test using 4He is harder than those using the other light elements due to the small dynamic range over which He/H varies for cosmologically interesting parameters. A precision of much better than 1% is needed. This precision challenges both observations and theory. Several of the major uncertainties were identified and methods of improving the accuracy were described.

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