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Revista mexicana de astronomía y astrofísica

Print version ISSN 0185-1101

Rev. mex. astron. astrofis vol.44 n.2 Ciudad de México Oct. 2008

 

The Helium and heavy elements enrichment of the Galactic Disk

 

L. Carigi1,2 and M. Peimbert1

 

1 Instituto de Astronomía, Universidad Nacional Autónoma de México, Apdo. Postal 70–264, 04510 México, D. F., México. (carigi@astroscu.unam.mx, lcarigi@uclan.ac.uk).

2 Centre for Astrophysics, University of Central Lancashire, Preston, Lancashire, PR1 2HE, United Kingdom. (peimbert@astroscu.unam.mx).

 

Received 2008 June 23
Accepted 2008 July 18

 

RESUMEN

Presentamos modelos de evolución química para el disco de nuestra galaxia. También presentamos una nueva determinación de X, Y, y Z para M17, una región H de nuestra galaxia rica en elementos pesados. Comparamos nuestros modelos del disco galáctico con las abundancias de las regiones H . El valor predicho por nuestro modelo para ΔYO es muy similar al valor que obtenemos por medio de las observaciones de M17 y la abundancia primordial de helio, Yp. A partir de M17 y Yp obtenemos que ΔYZ = 1.97 ± 0.41, resultado que concuerda con dos determinaciones de ΔYZ, obtenidas a partir de observaciones de estrellas enanas K de la vecindad solar, que corresponden a 2.1 ± 0.4 y 2.1 ± 0.9 respectivamente. Nuestros modelos ajustan razonablemente bien el valor de O/H con el que se formó el Sol.

 

ABSTRACT

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 H region. We compare our models for the Galactic disk with the Galactic H regions abundances. The ΔYO ratio predicted from the Galactic chemical evolution model is in very good agreement with the ΔYO value derived from M17 and the primordial helium abundance, Yp, taking into account the presence of temperature variations in this H region. From the M17 observations we obtain that ΔYZ = 1.97 ±0.41, in excellent agreement with two ΔYZ determinations derived from K dwarf stars of the solar vicinity that amount to 2.1 ± 0.4 and 2.1 ± 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.

Key Words: galaxies: abundances — galaxies: evolution — H II regions — ISM: abundances — ISM: individual (M17, Orion nebula) — Sun: abundances.

 

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