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

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...

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Autores principales: Santos Jr., J.F.C., Piatti, A.E.
Formato: JOUR
Materias:
Galaxies: star clusters
Stars: fundamental parameters
Techniques: spectroscopic
Approximation theory
Integration
Iterative methods
Parameter estimation
Photometry
Sensitivity analysis
Spectroscopic analysis
Metal contents
Galaxies
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v428_n1_p79_SantosJr
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046361_v428_n1_p79_SantosJr
record_format dspace
spelling todo:paper_00046361_v428_n1_p79_SantosJr2023-10-03T14:00:10Z Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra Santos Jr., J.F.C. Piatti, A.E. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v428_n1_p79_SantosJr
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Santos Jr., J.F.C.
Piatti, A.E.
Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra
topic_facet 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
description 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.
format JOUR
author Santos Jr., J.F.C.
Piatti, A.E.
author_facet Santos Jr., J.F.C.
Piatti, A.E.
author_sort Santos Jr., J.F.C.
title Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra
title_short Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra
title_full Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra
title_fullStr Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra
title_full_unstemmed Ages and metallicities of star clusters: New calibrations and diagnostic diagrams from visible integrated spectra
title_sort ages and metallicities of star clusters: new calibrations and diagnostic diagrams from visible integrated spectra
url http://hdl.handle.net/20.500.12110/paper_00046361_v428_n1_p79_SantosJr
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