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

Gary J. Ferland, Yuri Izotov, Antonio Peimbert, Manuel Peimbert, Ryan L. Porter, Evan Skillman, Gary Steigman

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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 4 He 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.

Original languageEnglish (US)
Pages (from-to)163-167
Number of pages5
JournalProceedings of the International Astronomical Union
Volume5
Issue numberS268
DOIs
StatePublished - 2009

Keywords

  • Galaxy: abundances
  • HII regions
  • ISM: abundances

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