Helium in three H II galaxies and the primordial helium abundance

Details Helium in three H II galaxies and the primordial helium abundance Helium in three H II galaxies and the primordial helium abundance

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rmxaa..18..153p&link_type=abstract

(Universidad Nacional Autonoma de Mexico and CONACYT, Conferencia Mexicana-Texana de Astrofisica, 2nd, Mexico City, MX, Feb. 22-

Physics

51

Abundance, H Ii Regions, Helium, Interstellar Chemistry, Interstellar Gas, Nuclear Fusion, Charge Coupled Devices, Cosmology, Line Spectra, Maximum Likelihood Estimates, Photoionization

Scientific paper

New measurements of 6678 A in the H II galaxies Tololo 1214-277, Michigan 461 and Tololo 0633-415, give helium abundances in close agreement with those derivable from the 4471 and 5876 lines previously observed by Terlevich et al. (1989). Furthermore, the exciting stars for the low-abundance objects T 1214-277 and Michigan 461 are so hot, and forbidden O II is so weak, that one can be quite sure, independently of photoionization models, that the correction for neutral helium is below 5 percent. This strengthens previous estimates of a pregalactic helium abundance close to 0.230. Implications for particle physics and cosmology are briefly discussed.

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