The Helium and Heavy Elements Enrichment of the Galactic Disk

Details The Helium and Heavy Elements Enrichment of the Galactic Disk The Helium and Heavy Elements Enrichment of the Galactic Disk

2008-01-18

arxiv.org/abs/0801.2867v3

Astronomy and Astrophysics

Astrophysics

to be published in the RevMexAA in October 2008

Scientific paper

We present chemical evolution models for the Galactic disk. We also present a new determination of X, Y, and Z for M17 a Galactic metal-rich Hii region. We compare our models for the Galactic disk with the Galactic Hii regions abundances. The $\Delta Y/\Delta O$ ratio predicted from the galactic chemical evolution model is in very good agreement with the $\Delta Y/\Delta O$ value derived from M17 and the primordial helium abundance, Yp, taking into account the presence of temperature variations in this Hii region. From the M17 observations we obtain that $\Delta Y/\Delta Z = 1.97 \pm 0.41$, in excellent agreement with two $\Delta Y/\Delta Z$ determinations derived from K dwarf stars of the solar vicinity that amount to $2.1 \pm 0.4$ and $2.1 \pm 0.9$ respectively. We also compare our models with the solar abundances. The solar and Orion nebula O/H values are in good agreement with our chemical evolution model.

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