| Título: | An interpretation of the line-strength indexes in old stellar populations using an evolutionary synthesis approach |
| Autores: | Aragón, A. ; Gorgas García, Francisco Javier ; Rego Fernández, Manuel |
| Tipo de documento: | texto impreso |
| Editorial: | EDP Sciencies, 1987-10 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Física: Astrofísica , Materia = Ciencias: Física: Astronomía , Tipo = Artículo |
| Resumen: |
Evolutionary population synthesis models with different metallicities have been computed in order to interpret the observed Mg_2 and H?, line-strength indices in old stellar populations. Both indices are found to be quite insensitive to changes in the slope of the IMF and the upper mass limit. These models have been applied to three different cases, with the following results: a) Galactic globular clusters do not exhibit a significant dispersion in age, and the metallicities of the computed models resemble those estimated for the clusters. The indices for the metal-poor globulars ([Fe/H] b) The line-strength gradients observed in the elliptical galaxy NGC 5813 are due, essentially, to intrinsic variations in metallicity, and they cannot be explained just from changes in the remaining parameters of the stellar population. c) In order to synthesize the M 32 indices we must introduce a star formation elapsed for a long time-scale , the star forrnation being still significant ? 5 Gyr ago. |
| En línea: | https://eprints.ucm.es/37471/1/gorgas66libre.pdf |
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