Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1005p&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Oct. 1986, p. 1005-1008.
Astronomy and Astrophysics
Astronomy
108
Abundance, Galaxies, Helium, Hydrogen Clouds, Astronomical Spectroscopy, Compact Galaxies, Emission Spectra, Stellar Winds, Wolf-Rayet Stars
Scientific paper
The determination of the pregalactic helium mass-fraction is addressed. Previous attempts to empirically determine Yp from a constant parameter dY/dZ are critically discussed, and new results based on extensive spectroscopy of emission-line galaxies by Terlevich and Melnick (1981) are examined. It is concluded from these new results that helium may correlate better with nitrogen than with oxygen. If Y is plotted against N/H, a single relationship holds for all objects, all the relationships extrapolating back to Yp = 0.237 + or - 0.005. It is suggested that the large value of dY/dZ in blue compact galaxies and the (Y, N/H) relation are due to local contamination by winds from Wolf-Rayet stars.
Melnick Jorge
Pagel Bernard E. J.
Terlevich Roberto Juan
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