Capture of field stars by globular clusters in dense bulge regions
Autor(a) principal: | |
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Data de Publicação: | 1997 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108836 |
Resumo: | The recent detection of a double red giant branch (RGB) in the optical color-magnitude diagram of the bulge globular cluster HP 1—a more populated, metal-poor, steep giant branch corresponding to the cluster itself and another that is metal rich and curved—led us to explore in the present Letter the possibility that field stars are captured by a globular cluster orbiting in dense bulge regions over several gigayears. Analytical arguments, as well as N-body calculations for a cluster model of 105 Mʘ in a bulgelike environment, suggest that a significant fraction of cluster stars may consist of captures. Metal-poor globular clusters in the inner bulge, like HP 1, contrasting in Δ[Fe/H] by at least 1.0 dex with respect to the surrounding metal-rich stars, are ideal probes to further test the capture scenario. In turn, if this scenario is confirmed, the double RGB of HP 1 could provide direct estimates of blanketing amounts, which is fundamental for the photometric calibration of metal-rich stellar populations. |
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Bica, Eduardo Luiz DamianiDottori, Horacio AlbertoRodrigues, IrapuanOrtolani, SergioBarbuy, Beatriz2015-01-08T02:13:06Z19970004-637Xhttp://hdl.handle.net/10183/108836000212950The recent detection of a double red giant branch (RGB) in the optical color-magnitude diagram of the bulge globular cluster HP 1—a more populated, metal-poor, steep giant branch corresponding to the cluster itself and another that is metal rich and curved—led us to explore in the present Letter the possibility that field stars are captured by a globular cluster orbiting in dense bulge regions over several gigayears. Analytical arguments, as well as N-body calculations for a cluster model of 105 Mʘ in a bulgelike environment, suggest that a significant fraction of cluster stars may consist of captures. Metal-poor globular clusters in the inner bulge, like HP 1, contrasting in Δ[Fe/H] by at least 1.0 dex with respect to the surrounding metal-rich stars, are ideal probes to further test the capture scenario. In turn, if this scenario is confirmed, the double RGB of HP 1 could provide direct estimates of blanketing amounts, which is fundamental for the photometric calibration of metal-rich stellar populations.application/pdfengThe astrophysical journal. Chicago. Vol. 482, no. 1, pt. 2 (June 1997), p. L49-L51Aglomerados estelares globularesGalaxiaComposicao estelarDinamica estelarGalaxy: kinematics and dynamicsGlobular clusters: individual (HP 1)Globular clusters: generalMethods: analyticalMethods: numericalCapture of field stars by globular clusters in dense bulge regionsEstrangeiroinfo: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:UFRGSORIGINAL000212950.pdf000212950.pdfTexto completo (inglês)application/pdf159343http://www.lume.ufrgs.br/bitstream/10183/108836/1/000212950.pdf1e113dc36d1ace3425082503033c1d25MD51TEXT000212950.pdf.txt000212950.pdf.txtExtracted Texttext/plain15674http://www.lume.ufrgs.br/bitstream/10183/108836/2/000212950.pdf.txt6c37e37d4619538fa83979dff4d67e93MD52THUMBNAIL000212950.pdf.jpg000212950.pdf.jpgGenerated Thumbnailimage/jpeg1891http://www.lume.ufrgs.br/bitstream/10183/108836/3/000212950.pdf.jpgb2e2fa73382b784f76637f73d6ccb7b4MD5310183/1088362024-04-13 06:46:05.470149oai:www.lume.ufrgs.br:10183/108836Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-04-13T09:46:05Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Capture of field stars by globular clusters in dense bulge regions |
title |
Capture of field stars by globular clusters in dense bulge regions |
spellingShingle |
Capture of field stars by globular clusters in dense bulge regions Bica, Eduardo Luiz Damiani Aglomerados estelares globulares Galaxia Composicao estelar Dinamica estelar Galaxy: kinematics and dynamics Globular clusters: individual (HP 1) Globular clusters: general Methods: analytical Methods: numerical |
title_short |
Capture of field stars by globular clusters in dense bulge regions |
title_full |
Capture of field stars by globular clusters in dense bulge regions |
title_fullStr |
Capture of field stars by globular clusters in dense bulge regions |
title_full_unstemmed |
Capture of field stars by globular clusters in dense bulge regions |
title_sort |
Capture of field stars by globular clusters in dense bulge regions |
author |
Bica, Eduardo Luiz Damiani |
author_facet |
Bica, Eduardo Luiz Damiani Dottori, Horacio Alberto Rodrigues, Irapuan Ortolani, Sergio Barbuy, Beatriz |
author_role |
author |
author2 |
Dottori, Horacio Alberto Rodrigues, Irapuan Ortolani, Sergio Barbuy, Beatriz |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Bica, Eduardo Luiz Damiani Dottori, Horacio Alberto Rodrigues, Irapuan Ortolani, Sergio Barbuy, Beatriz |
dc.subject.por.fl_str_mv |
Aglomerados estelares globulares Galaxia Composicao estelar Dinamica estelar |
topic |
Aglomerados estelares globulares Galaxia Composicao estelar Dinamica estelar Galaxy: kinematics and dynamics Globular clusters: individual (HP 1) Globular clusters: general Methods: analytical Methods: numerical |
dc.subject.eng.fl_str_mv |
Galaxy: kinematics and dynamics Globular clusters: individual (HP 1) Globular clusters: general Methods: analytical Methods: numerical |
description |
The recent detection of a double red giant branch (RGB) in the optical color-magnitude diagram of the bulge globular cluster HP 1—a more populated, metal-poor, steep giant branch corresponding to the cluster itself and another that is metal rich and curved—led us to explore in the present Letter the possibility that field stars are captured by a globular cluster orbiting in dense bulge regions over several gigayears. Analytical arguments, as well as N-body calculations for a cluster model of 105 Mʘ in a bulgelike environment, suggest that a significant fraction of cluster stars may consist of captures. Metal-poor globular clusters in the inner bulge, like HP 1, contrasting in Δ[Fe/H] by at least 1.0 dex with respect to the surrounding metal-rich stars, are ideal probes to further test the capture scenario. In turn, if this scenario is confirmed, the double RGB of HP 1 could provide direct estimates of blanketing amounts, which is fundamental for the photometric calibration of metal-rich stellar populations. |
publishDate |
1997 |
dc.date.issued.fl_str_mv |
1997 |
dc.date.accessioned.fl_str_mv |
2015-01-08T02:13:06Z |
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 |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/108836 |
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0004-637X |
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000212950 |
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0004-637X 000212950 |
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http://hdl.handle.net/10183/108836 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Chicago. Vol. 482, no. 1, pt. 2 (June 1997), p. L49-L51 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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