Computer Science
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983prhe.work..305k&link_type=abstract
IN: ESO Workshop on Primordial Helium, Garching, West Germany, February 2, 3, 1983, Proceedings (A83-50030 24-90). Garching, Wes
Computer Science
9
Abundance, Galactic Evolution, H Ii Regions, Helium Ions, Intergalactic Media, Compact Galaxies, Correlation Detection, Heavy Elements, Luminosity, Mass Distribution, Oxygen, Temperature Distribution
Scientific paper
The validity of various theoretical methods of determining primordial abundances from observations of H+ and He+ abundances in galactic H II regions is discussed. Consideration is devoted to correlations between H and He abundances, conditions of no correlation, and data for very low He/H values in single objects. The data for the LMC, I Zw 18, II Zw 40, etc., are examined for correlation levels. It is shown that no He abundances less than 0.24 have been found in either giant H II regions or blue compact galaxies, so the He abundance is projected to be within 0.010 of 0.245, within three standard deviations. Finally, it is suggested that He deficient objects experiencing star formation may not even exist 1,000,000 years after the initial burst that formed the cluster.
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