The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis
Autor(a) principal: | |
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Data de Publicação: | 1986 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/98522 |
Resumo: | We study the equivalent width W of the Na I D lines in 41 globular clusters with reddening O ≤ (B-V) ≤ 1.11 and a wide spatial distribution in the Galaxy. Contributions to the line absorption from the stellar and interstellar components are separated via comparisons with the Ca II K and the Mg I b lines. The value W(Na I) is found to be enhanced for reddened clusters. The relationship between interstellar Na I and E(B-V) presents a steeper slope for globular clusters than that derived for stars in the solar neighborhood. In view of stellar population synthesis in galaxies, we study the age and metallicity effects in the W(Na I) vs W(Mg I) plane by means of 15 Magellanic Cloud and 3 Galactic open clusters. For solar and lower than solar metallicities a large excess E(Na I) can be produced only by interstellar line absorption. We also analyze 154 normal and 11 active galactic nuclei. We find that the Na I line is enhanced with galaxy inclination in spirals. Very metallic early type galaxies deviate from linear relationship in the W(Na I) vs W(Mg I) plane. This excess of the Na I absorption can be equally accounted for by, (i) an interstellar contribution from the central regions and/or an extended halo compatible with the existing H I detections in early type galaxies, and (ii) an enhancement of W(Na I) with respect to W(Mg I) in the atmos pheres of very metal rich late type stars as suggested by synthetic spectra computations. |
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Bica, Eduardo Luiz DamianiAlloin, Danielle Marie2014-07-24T02:04:27Z19860004-6361http://hdl.handle.net/10183/98522000430344We study the equivalent width W of the Na I D lines in 41 globular clusters with reddening O ≤ (B-V) ≤ 1.11 and a wide spatial distribution in the Galaxy. Contributions to the line absorption from the stellar and interstellar components are separated via comparisons with the Ca II K and the Mg I b lines. The value W(Na I) is found to be enhanced for reddened clusters. The relationship between interstellar Na I and E(B-V) presents a steeper slope for globular clusters than that derived for stars in the solar neighborhood. In view of stellar population synthesis in galaxies, we study the age and metallicity effects in the W(Na I) vs W(Mg I) plane by means of 15 Magellanic Cloud and 3 Galactic open clusters. For solar and lower than solar metallicities a large excess E(Na I) can be produced only by interstellar line absorption. We also analyze 154 normal and 11 active galactic nuclei. We find that the Na I line is enhanced with galaxy inclination in spirals. Very metallic early type galaxies deviate from linear relationship in the W(Na I) vs W(Mg I) plane. This excess of the Na I absorption can be equally accounted for by, (i) an interstellar contribution from the central regions and/or an extended halo compatible with the existing H I detections in early type galaxies, and (ii) an enhancement of W(Na I) with respect to W(Mg I) in the atmos pheres of very metal rich late type stars as suggested by synthetic spectra computations.application/pdfengAstronomy and astrophysics. Vol. 166, no. 1/2 (Sept. 1986), p. 83-91Populacoes estelaresInterstellar Na IGlobular clustersGalactic inclination effectsThe interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesisEstrangeiroinfo: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:UFRGSORIGINAL000430344.pdf000430344.pdfTexto completo (inglês)application/pdf255781http://www.lume.ufrgs.br/bitstream/10183/98522/1/000430344.pdfbfd256e3a6ada65fe7446f4f460e084cMD51TEXT000430344.pdf.txt000430344.pdf.txtExtracted Texttext/plain198http://www.lume.ufrgs.br/bitstream/10183/98522/2/000430344.pdf.txt8701e2c9fa70642ec30cae580330b41cMD52THUMBNAIL000430344.pdf.jpg000430344.pdf.jpgGenerated Thumbnailimage/jpeg2027http://www.lume.ufrgs.br/bitstream/10183/98522/3/000430344.pdf.jpgc0ae4a53aa9a628502c6c01af9eb662dMD5310183/985222024-04-17 06:35:37.934664oai:www.lume.ufrgs.br:10183/98522Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-17T09:35:37Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis |
title |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis |
spellingShingle |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis Bica, Eduardo Luiz Damiani Populacoes estelares Interstellar Na I Globular clusters Galactic inclination effects |
title_short |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis |
title_full |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis |
title_fullStr |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis |
title_full_unstemmed |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis |
title_sort |
The interstellar Na I strength versus reddening relationship : its incidence on stellar population synthesis |
author |
Bica, Eduardo Luiz Damiani |
author_facet |
Bica, Eduardo Luiz Damiani Alloin, Danielle Marie |
author_role |
author |
author2 |
Alloin, Danielle Marie |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Bica, Eduardo Luiz Damiani Alloin, Danielle Marie |
dc.subject.por.fl_str_mv |
Populacoes estelares |
topic |
Populacoes estelares Interstellar Na I Globular clusters Galactic inclination effects |
dc.subject.eng.fl_str_mv |
Interstellar Na I Globular clusters Galactic inclination effects |
description |
We study the equivalent width W of the Na I D lines in 41 globular clusters with reddening O ≤ (B-V) ≤ 1.11 and a wide spatial distribution in the Galaxy. Contributions to the line absorption from the stellar and interstellar components are separated via comparisons with the Ca II K and the Mg I b lines. The value W(Na I) is found to be enhanced for reddened clusters. The relationship between interstellar Na I and E(B-V) presents a steeper slope for globular clusters than that derived for stars in the solar neighborhood. In view of stellar population synthesis in galaxies, we study the age and metallicity effects in the W(Na I) vs W(Mg I) plane by means of 15 Magellanic Cloud and 3 Galactic open clusters. For solar and lower than solar metallicities a large excess E(Na I) can be produced only by interstellar line absorption. We also analyze 154 normal and 11 active galactic nuclei. We find that the Na I line is enhanced with galaxy inclination in spirals. Very metallic early type galaxies deviate from linear relationship in the W(Na I) vs W(Mg I) plane. This excess of the Na I absorption can be equally accounted for by, (i) an interstellar contribution from the central regions and/or an extended halo compatible with the existing H I detections in early type galaxies, and (ii) an enhancement of W(Na I) with respect to W(Mg I) in the atmos pheres of very metal rich late type stars as suggested by synthetic spectra computations. |
publishDate |
1986 |
dc.date.issued.fl_str_mv |
1986 |
dc.date.accessioned.fl_str_mv |
2014-07-24T02:04:27Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10183/98522 |
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0004-6361 |
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000430344 |
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0004-6361 000430344 |
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http://hdl.handle.net/10183/98522 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Vol. 166, no. 1/2 (Sept. 1986), p. 83-91 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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