Some aspects of the chemical evolution of 4He in the Galaxy: the He/H abundance gradient and the Delta Y/Delta Z enrichment ratio

Details Some aspects of the chemical evolution of 4He in the Galaxy: the He/H abundance gradient and the Delta Y/Delta Z enrichment ratio Some aspects of the chemical evolution of 4He in the Galaxy: the He/H abundance gradient and the Delta Y/Delta Z enrichment ratio

2000-06-28

arxiv.org/abs/astro-ph/0006410v1

Astronomy and Astrophysics

Astrophysics

10 pages, 5 postscript figures, Latex, uses newpasp.sty, psfig.sty, to be published in the proceedings of IAU Syposium 198, Th

Scientific paper

Two aspects of the chemical evolution of 4He in the Galaxy are considered on
the basis of a sample of disk planetary nebulae by the application of
corrections due to the contamination of 4He from the progenitor stars. First,
the He/H radial gradient is analyzed, and then, the helium to heavy element
enrichment ratio is determined for metallicities up to the solar value.

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