Properties of five low-contrast open clusters in the third quadrant
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/98973 |
Resumo: | We derive photometric, structural and dynamical evolution-related parameters of five as yet unstudied low-contrast open clusters located in the third quadrant using 2MASS data. The target clusters are Czernik 31, Czernik 32, Haffner 9, Haffner 11 and Trumpler 13. We apply a statistical field-star decontamination procedure to infer on the intrinsic colour–magnitude diagram (CMD) morphology which is critical for such lowcontrast objects. Consequently, it became possible to derive accurate reddening, age, distance from the Sun and Galactocentric distance for the five clusters. In the structural and luminosity/mass-function analyses we apply a colour-magnitude filter which encompasses the cluster evolutionary CMD sequences and excludes stars with discrepant colours. Using this procedure we derive core and limiting radii, mass function (MF) slope, total mass, mass density and relaxation time. We derive ages in the range 140–1100 Myr, Galactocentric distances within 7.7– 11.4 kpc, and total masses within 360–2900 Mʘ. Reflecting large-scale mass segregation, the MF slope in the core is significantly flatter than that in the halo of the five clusters. Although some of the present clusters are relatively younger than the Gyr-old clusters, they present evidence of advanced dynamical evolution. This kind of study has become possible because of the photometric uniformity and spatial coverage of 2MASS which allows a proper subtraction of the field-star contamination on the target CMDs. The present study indicates that low-contrast clusters can be studied with 2MASS, particularly after field-star subtraction, which is important since most of the unstudied open clusters belong to this class. |
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Bica, Eduardo Luiz DamianiBonatto, Charles Jose2014-07-31T02:05:07Z20050004-6361http://hdl.handle.net/10183/98973000538411We derive photometric, structural and dynamical evolution-related parameters of five as yet unstudied low-contrast open clusters located in the third quadrant using 2MASS data. The target clusters are Czernik 31, Czernik 32, Haffner 9, Haffner 11 and Trumpler 13. We apply a statistical field-star decontamination procedure to infer on the intrinsic colour–magnitude diagram (CMD) morphology which is critical for such lowcontrast objects. Consequently, it became possible to derive accurate reddening, age, distance from the Sun and Galactocentric distance for the five clusters. In the structural and luminosity/mass-function analyses we apply a colour-magnitude filter which encompasses the cluster evolutionary CMD sequences and excludes stars with discrepant colours. Using this procedure we derive core and limiting radii, mass function (MF) slope, total mass, mass density and relaxation time. We derive ages in the range 140–1100 Myr, Galactocentric distances within 7.7– 11.4 kpc, and total masses within 360–2900 Mʘ. Reflecting large-scale mass segregation, the MF slope in the core is significantly flatter than that in the halo of the five clusters. Although some of the present clusters are relatively younger than the Gyr-old clusters, they present evidence of advanced dynamical evolution. This kind of study has become possible because of the photometric uniformity and spatial coverage of 2MASS which allows a proper subtraction of the field-star contamination on the target CMDs. The present study indicates that low-contrast clusters can be studied with 2MASS, particularly after field-star subtraction, which is important since most of the unstudied open clusters belong to this class.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 443, no. 2 (Nov. 2005), p. 465-475GaláxiasAglomerados abertos e associaçõesGalaxiaAglomerados estelaresGalaxy: open clusters and associations: generalGalaxy: structureProperties of five low-contrast open clusters in the third quadrantEstrangeiroinfo: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:UFRGSORIGINAL000538411.pdf000538411.pdfTexto completo (inglês)application/pdf1146614http://www.lume.ufrgs.br/bitstream/10183/98973/1/000538411.pdf4cebe7dd6f400eac54fb66400ac6f46bMD51TEXT000538411.pdf.txt000538411.pdf.txtExtracted Texttext/plain46919http://www.lume.ufrgs.br/bitstream/10183/98973/2/000538411.pdf.txtb250d6f83493635d11e6b7ad007ef1d3MD52THUMBNAIL000538411.pdf.jpg000538411.pdf.jpgGenerated Thumbnailimage/jpeg2097http://www.lume.ufrgs.br/bitstream/10183/98973/3/000538411.pdf.jpg712615e8d575630ab64071c2ee3d3efcMD5310183/989732023-07-15 03:28:35.993978oai:www.lume.ufrgs.br:10183/98973Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:28:35Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Properties of five low-contrast open clusters in the third quadrant |
title |
Properties of five low-contrast open clusters in the third quadrant |
spellingShingle |
Properties of five low-contrast open clusters in the third quadrant Bica, Eduardo Luiz Damiani Galáxias Aglomerados abertos e associações Galaxia Aglomerados estelares Galaxy: open clusters and associations: general Galaxy: structure |
title_short |
Properties of five low-contrast open clusters in the third quadrant |
title_full |
Properties of five low-contrast open clusters in the third quadrant |
title_fullStr |
Properties of five low-contrast open clusters in the third quadrant |
title_full_unstemmed |
Properties of five low-contrast open clusters in the third quadrant |
title_sort |
Properties of five low-contrast open clusters in the third quadrant |
author |
Bica, Eduardo Luiz Damiani |
author_facet |
Bica, Eduardo Luiz Damiani Bonatto, Charles Jose |
author_role |
author |
author2 |
Bonatto, Charles Jose |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Bica, Eduardo Luiz Damiani Bonatto, Charles Jose |
dc.subject.por.fl_str_mv |
Galáxias Aglomerados abertos e associações Galaxia Aglomerados estelares |
topic |
Galáxias Aglomerados abertos e associações Galaxia Aglomerados estelares Galaxy: open clusters and associations: general Galaxy: structure |
dc.subject.eng.fl_str_mv |
Galaxy: open clusters and associations: general Galaxy: structure |
description |
We derive photometric, structural and dynamical evolution-related parameters of five as yet unstudied low-contrast open clusters located in the third quadrant using 2MASS data. The target clusters are Czernik 31, Czernik 32, Haffner 9, Haffner 11 and Trumpler 13. We apply a statistical field-star decontamination procedure to infer on the intrinsic colour–magnitude diagram (CMD) morphology which is critical for such lowcontrast objects. Consequently, it became possible to derive accurate reddening, age, distance from the Sun and Galactocentric distance for the five clusters. In the structural and luminosity/mass-function analyses we apply a colour-magnitude filter which encompasses the cluster evolutionary CMD sequences and excludes stars with discrepant colours. Using this procedure we derive core and limiting radii, mass function (MF) slope, total mass, mass density and relaxation time. We derive ages in the range 140–1100 Myr, Galactocentric distances within 7.7– 11.4 kpc, and total masses within 360–2900 Mʘ. Reflecting large-scale mass segregation, the MF slope in the core is significantly flatter than that in the halo of the five clusters. Although some of the present clusters are relatively younger than the Gyr-old clusters, they present evidence of advanced dynamical evolution. This kind of study has become possible because of the photometric uniformity and spatial coverage of 2MASS which allows a proper subtraction of the field-star contamination on the target CMDs. The present study indicates that low-contrast clusters can be studied with 2MASS, particularly after field-star subtraction, which is important since most of the unstudied open clusters belong to this class. |
publishDate |
2005 |
dc.date.issued.fl_str_mv |
2005 |
dc.date.accessioned.fl_str_mv |
2014-07-31T02:05:07Z |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Les Ulis. Vol. 443, no. 2 (Nov. 2005), p. 465-475 |
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openAccess |
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