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Artículo

Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra

Santos Jr, J. F. C.; Piatti, Andres EduardoIcon
Fecha de publicación: 12/2004
Editorial: EDP Sciences
Revista: Astronomy and Astrophysics
ISSN: 0004-6361
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We present homogeneous scales of ages and metallicities for star clusters from very young objects, through intermediate-age ones up to the oldest known clusters. All the selected clusters have integrated spectra in the visible range, as well as reliable determinations of their ages and metallicities. From these spectra equivalent widths (EWs) of K Ca II, G band (CH) and Mg I metallic, and Hδ, Hγ and Hβ Balmer lines have been measured homogeneously. The analysis of these EWs shows that the EW sums of the metallic and Balmer H lines, separately, are good indicators of cluster age for objects younger than 10 Gyr, and that the former is also sensitive to cluster metallicity for ages greater than 10 Gyr. We propose an iterative procedure for estimating cluster ages by employing two new diagnostic diagrams and age calibrations based on the above EW sums. For clusters older than 10 Gyr, we also provide a calibration to derive their overall metal contents.

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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/21155
DOI: http://dx.doi.org/10.1051/0004-6361:20041560
URL: https://www.aanda.org/articles/aa/abs/2004/46/aa1560/aa1560.html
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Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Santos Jr, J. F. C.; Piatti, Andres Eduardo; Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra; EDP Sciences; Astronomy and Astrophysics; 428; 1; 12-2004; 79-88
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