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Abstract:

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.

Registro:

Documento: Artículo
Título:Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra
Autor:Santos Jr., J.F.C.; Piatti, A.E.
Filiación:Departamento de Física, ICEx, UFMG, 30123-970 Belo Horizonte, MG, Brazil
Inst. de Astron. y Fis. Del Espacio, CC 67, Sue. 28, 1428, Buenos Aires, Argentina
Palabras clave:Galaxies: star clusters; Stars: fundamental parameters; Techniques: spectroscopic; Approximation theory; Integration; Iterative methods; Parameter estimation; Photometry; Sensitivity analysis; Spectroscopic analysis; Galaxies: star clusters; Metal contents; Stars: fundamental parameters; Techniques: spectroscopic; Galaxies
Año:2004
Volumen:428
Número:1
Página de inicio:79
Página de fin:88
DOI: http://dx.doi.org/10.1051/0004-6361:20041560
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v428_n1_p79_SantosJr

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Citas:

---------- APA ----------
Santos Jr., J.F.C. & Piatti, A.E. (2004) . Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra. Astronomy and Astrophysics, 428(1), 79-88.
http://dx.doi.org/10.1051/0004-6361:20041560
---------- CHICAGO ----------
Santos Jr., J.F.C., Piatti, A.E. "Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra" . Astronomy and Astrophysics 428, no. 1 (2004) : 79-88.
http://dx.doi.org/10.1051/0004-6361:20041560
---------- MLA ----------
Santos Jr., J.F.C., Piatti, A.E. "Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra" . Astronomy and Astrophysics, vol. 428, no. 1, 2004, pp. 79-88.
http://dx.doi.org/10.1051/0004-6361:20041560
---------- VANCOUVER ----------
Santos Jr., J.F.C., Piatti, A.E. Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra. Astron. Astrophys. 2004;428(1):79-88.
http://dx.doi.org/10.1051/0004-6361:20041560