Galactic helium and stellar population colors

Details Galactic helium and stellar population colors Galactic helium and stellar population colors

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983prhe.work..243r&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

Cosmic Gases, Galactic Structure, Helium, Stellar Color, Abundance, Cosmochemistry, Metallicity, Star Formation Rate, Stellar Evolution, Stellar Luminosity

Scientific paper

The sensitivity of the colors and luminosities in different spectral regions of a synthetic stellar population to its helium-Y abundance is analyzed with an evolutionary model. Possible evolutions of the luminosities at 2.4 microns and 1700 A are given. The evolution of (B-V) is presented as a function of the ratio of the present over past star-formation rate, calculated for two helium abundances Y = 0.20 and Y = 0.30 and the metallicity Z = 0.001. It is noted that a Delta(Y) = 0.1 variation induces a color variation Delta(B-V) = 0.25 for the bluest galaxies. The observational colors of blue galaxies indicate a Y = 0.25-0.30 value in agreement with the spectroscopic value. A Delta(Y)/Delta(Z) estimation could be hopefully determined by a similar analysis with the Z = 0.0001 composition.

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