Reddening and age for 11 galactic open clusters from integrated spectra
Autor(a) principal: | |
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Data de Publicação: | 1993 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/88380 |
Resumo: | We study integrated spectra of 11 Galactic open clusters in the visible and near infrared. We use continuum distribution and line strengths to infer reddening, age and, in some cases, metallicity. These parameters are derived by using different methods, mainly by employing template integrated spectra of Magellanic Clouds and Galactic star clusters with known properties, as well as a grid relating the equivalent widths of spectral absorption tines to age and metallicity spanning a wide range of values. The results indicate a good agreement with previous work based mainly on colour-magnitude diagrams, when available. Internal reddening is significant for very young clusters like NGC 3603 and 6611. A Wolf-Rayet star in NGC 6231 is also analysed spectroscopically in the cluster context. Wolf-Rayet features appearing in the integrated spectra of NGC 6231 and 3603 are employed as indicators of the cluster evolutionary stage. The oldest cluster in the sample has an age ~~300 Myr. The present sample considerably improves the age resolution around solar metallicity in the cluster spectrallibrary for population synthesis. |
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Santos Junior, Joao Francisco Coelho dosBica, Eduardo Luiz Damiani2014-03-13T01:50:42Z19930035-8711http://hdl.handle.net/10183/88380000056148We study integrated spectra of 11 Galactic open clusters in the visible and near infrared. We use continuum distribution and line strengths to infer reddening, age and, in some cases, metallicity. These parameters are derived by using different methods, mainly by employing template integrated spectra of Magellanic Clouds and Galactic star clusters with known properties, as well as a grid relating the equivalent widths of spectral absorption tines to age and metallicity spanning a wide range of values. The results indicate a good agreement with previous work based mainly on colour-magnitude diagrams, when available. Internal reddening is significant for very young clusters like NGC 3603 and 6611. A Wolf-Rayet star in NGC 6231 is also analysed spectroscopically in the cluster context. Wolf-Rayet features appearing in the integrated spectra of NGC 6231 and 3603 are employed as indicators of the cluster evolutionary stage. The oldest cluster in the sample has an age ~~300 Myr. The present sample considerably improves the age resolution around solar metallicity in the cluster spectrallibrary for population synthesis.application/pdfengMonthly Notices of the Royal Astronomical Society. London. Vol. 260, no. 4 (Feb. 1993), p. 915-924Astrofisica extragalaticaAstrofísicaStars: abundancesStars: evolutionStars: Wolf-RayetDust, extinctionOpen clusters and associations: generalReddening and age for 11 galactic open clusters from integrated spectraEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000056148.pdf000056148.pdfTexto completo (inglês)application/pdf245760http://www.lume.ufrgs.br/bitstream/10183/88380/1/000056148.pdf0e9262c5bd52fa233ea058cc931e2cbfMD51TEXT000056148.pdf.txt000056148.pdf.txtExtracted Texttext/plain220http://www.lume.ufrgs.br/bitstream/10183/88380/2/000056148.pdf.txt4e13c9f71e5e7b4f01a53b7fe63a002cMD52THUMBNAIL000056148.pdf.jpg000056148.pdf.jpgGenerated Thumbnailimage/jpeg2013http://www.lume.ufrgs.br/bitstream/10183/88380/3/000056148.pdf.jpg05a69259c1d7e819ec8cb2fd8ad277a3MD5310183/883802024-04-14 06:45:41.145669oai:www.lume.ufrgs.br:10183/88380Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-14T09:45:41Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Reddening and age for 11 galactic open clusters from integrated spectra |
title |
Reddening and age for 11 galactic open clusters from integrated spectra |
spellingShingle |
Reddening and age for 11 galactic open clusters from integrated spectra Santos Junior, Joao Francisco Coelho dos Astrofisica extragalatica Astrofísica Stars: abundances Stars: evolution Stars: Wolf-Rayet Dust, extinction Open clusters and associations: general |
title_short |
Reddening and age for 11 galactic open clusters from integrated spectra |
title_full |
Reddening and age for 11 galactic open clusters from integrated spectra |
title_fullStr |
Reddening and age for 11 galactic open clusters from integrated spectra |
title_full_unstemmed |
Reddening and age for 11 galactic open clusters from integrated spectra |
title_sort |
Reddening and age for 11 galactic open clusters from integrated spectra |
author |
Santos Junior, Joao Francisco Coelho dos |
author_facet |
Santos Junior, Joao Francisco Coelho dos Bica, Eduardo Luiz Damiani |
author_role |
author |
author2 |
Bica, Eduardo Luiz Damiani |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Santos Junior, Joao Francisco Coelho dos Bica, Eduardo Luiz Damiani |
dc.subject.por.fl_str_mv |
Astrofisica extragalatica Astrofísica |
topic |
Astrofisica extragalatica Astrofísica Stars: abundances Stars: evolution Stars: Wolf-Rayet Dust, extinction Open clusters and associations: general |
dc.subject.eng.fl_str_mv |
Stars: abundances Stars: evolution Stars: Wolf-Rayet Dust, extinction Open clusters and associations: general |
description |
We study integrated spectra of 11 Galactic open clusters in the visible and near infrared. We use continuum distribution and line strengths to infer reddening, age and, in some cases, metallicity. These parameters are derived by using different methods, mainly by employing template integrated spectra of Magellanic Clouds and Galactic star clusters with known properties, as well as a grid relating the equivalent widths of spectral absorption tines to age and metallicity spanning a wide range of values. The results indicate a good agreement with previous work based mainly on colour-magnitude diagrams, when available. Internal reddening is significant for very young clusters like NGC 3603 and 6611. A Wolf-Rayet star in NGC 6231 is also analysed spectroscopically in the cluster context. Wolf-Rayet features appearing in the integrated spectra of NGC 6231 and 3603 are employed as indicators of the cluster evolutionary stage. The oldest cluster in the sample has an age ~~300 Myr. The present sample considerably improves the age resolution around solar metallicity in the cluster spectrallibrary for population synthesis. |
publishDate |
1993 |
dc.date.issued.fl_str_mv |
1993 |
dc.date.accessioned.fl_str_mv |
2014-03-13T01:50:42Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/88380 |
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0035-8711 |
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000056148 |
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url |
http://hdl.handle.net/10183/88380 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly Notices of the Royal Astronomical Society. London. Vol. 260, no. 4 (Feb. 1993), p. 915-924 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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