Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr

Aims. Integrated spectroscopy of a sample of 17 blue concentrated Large Magellanic Cloud (LMC) clusters is presented and its spectral evolution studied. The spectra span the range ≈(3600-6800) Å with a resolution of ≈14 Å FWHM, being used to determine cluster ages and, in connection with their spati...

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Autores principales: Santos Jr., J.F.C., Clariá, J.J., Ahumada, A.V., Bica, E., Piatti, A.E., Parisi, M.C.
Formato: JOUR
Materias:
Galaxies: star clusters
Magellanic Clouds
Techniques: spectroscopic
Astrophysics
Calibration
Space research
Spectroscopy
Spectrum analysis
Large Magellanic Cloud (LMC)
Spatial distribution
Spectral libraries
Galaxies
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v448_n3_p1023_SantosJr
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046361_v448_n3_p1023_SantosJr
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spelling todo:paper_00046361_v448_n3_p1023_SantosJr2023-10-03T14:00:14Z Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr Santos Jr., J.F.C. Clariá, J.J. Ahumada, A.V. Bica, E. Piatti, A.E. Parisi, M.C. Galaxies: star clusters Magellanic Clouds Techniques: spectroscopic Astrophysics Calibration Space research Spectroscopy Spectrum analysis Galaxies: star clusters Large Magellanic Cloud (LMC) Spatial distribution Spectral libraries Techniques: spectroscopic Galaxies Aims. Integrated spectroscopy of a sample of 17 blue concentrated Large Magellanic Cloud (LMC) clusters is presented and its spectral evolution studied. The spectra span the range ≈(3600-6800) Å with a resolution of ≈14 Å FWHM, being used to determine cluster ages and, in connection with their spatial distribution, to explore the LMC structure and cluster formation history. Methods. Cluster reddening values were estimated by interpolation, using the available extinction maps. We used two methods to derive cluster ages: (i) template matching, in which line strengths and continuum distribution of the cluster spectra were compared and matched to those of template clusters with known astrophysical properties, and (ii) equivalent width (EW) method, in which new age/metallicity calibrations were used together with diagnostic diagrams involving the sum of EWs of selected spectral lines (K Ca II, G band (CH), Mg I, Hδ, Hγ and Hβ). Results. The derived cluster ages range from 40 Myr (NGC 2130 and SL 237) to 300 Myr (NGC 1932 and SL 709), a good agreement between the results of the two methods being obtained. Combining the present sample with additional ones indicates that cluster deprojected distances from the LMC center are related to age in the sense that inner clusters tend to be younger. Conclusions. Spectral libraries of star clusters are useful datasets for spectral classifications and extraction of parameter information for target star clusters and galaxies. The present cluster sample complements previous ones, in an effort to gather a spectral library with several clusters per age bin. © ESO 2006. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v448_n3_p1023_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
Magellanic Clouds
Techniques: spectroscopic
Astrophysics
Calibration
Space research
Spectroscopy
Spectrum analysis
Galaxies: star clusters
Large Magellanic Cloud (LMC)
Spatial distribution
Spectral libraries
Techniques: spectroscopic
Galaxies
spellingShingle Galaxies: star clusters
Magellanic Clouds
Techniques: spectroscopic
Astrophysics
Calibration
Space research
Spectroscopy
Spectrum analysis
Galaxies: star clusters
Large Magellanic Cloud (LMC)
Spatial distribution
Spectral libraries
Techniques: spectroscopic
Galaxies
Santos Jr., J.F.C.
Clariá, J.J.
Ahumada, A.V.
Bica, E.
Piatti, A.E.
Parisi, M.C.
Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr
topic_facet Galaxies: star clusters
Magellanic Clouds
Techniques: spectroscopic
Astrophysics
Calibration
Space research
Spectroscopy
Spectrum analysis
Galaxies: star clusters
Large Magellanic Cloud (LMC)
Spatial distribution
Spectral libraries
Techniques: spectroscopic
Galaxies
description Aims. Integrated spectroscopy of a sample of 17 blue concentrated Large Magellanic Cloud (LMC) clusters is presented and its spectral evolution studied. The spectra span the range ≈(3600-6800) Å with a resolution of ≈14 Å FWHM, being used to determine cluster ages and, in connection with their spatial distribution, to explore the LMC structure and cluster formation history. Methods. Cluster reddening values were estimated by interpolation, using the available extinction maps. We used two methods to derive cluster ages: (i) template matching, in which line strengths and continuum distribution of the cluster spectra were compared and matched to those of template clusters with known astrophysical properties, and (ii) equivalent width (EW) method, in which new age/metallicity calibrations were used together with diagnostic diagrams involving the sum of EWs of selected spectral lines (K Ca II, G band (CH), Mg I, Hδ, Hγ and Hβ). Results. The derived cluster ages range from 40 Myr (NGC 2130 and SL 237) to 300 Myr (NGC 1932 and SL 709), a good agreement between the results of the two methods being obtained. Combining the present sample with additional ones indicates that cluster deprojected distances from the LMC center are related to age in the sense that inner clusters tend to be younger. Conclusions. Spectral libraries of star clusters are useful datasets for spectral classifications and extraction of parameter information for target star clusters and galaxies. The present cluster sample complements previous ones, in an effort to gather a spectral library with several clusters per age bin. © ESO 2006.
format JOUR
author Santos Jr., J.F.C.
Clariá, J.J.
Ahumada, A.V.
Bica, E.
Piatti, A.E.
Parisi, M.C.
author_facet Santos Jr., J.F.C.
Clariá, J.J.
Ahumada, A.V.
Bica, E.
Piatti, A.E.
Parisi, M.C.
author_sort Santos Jr., J.F.C.
title Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr
title_short Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr
title_full Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr
title_fullStr Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr
title_full_unstemmed Spectral evolution of star clusters in the Large Magellanic Cloud I. Blue concentrated clusters in the age range 40-300 Myr
title_sort spectral evolution of star clusters in the large magellanic cloud i. blue concentrated clusters in the age range 40-300 myr
url http://hdl.handle.net/20.500.12110/paper_00046361_v448_n3_p1023_SantosJr
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