Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/99043 |
Resumo: | Context. Poorly-populated star clusters may have photometric and structural properties not much different from asterisms, to the point that, in some cases, widely-used databases present conflicting classifications. Aims. We investigate the nature of a sample of challenging targets that have been classified either as star clusters or asterisms in different studies. A few objects are studied for the first time. Methods. The analysis employs 2MASS photometry, field-star decontamination, to enhance the intrinsic colour–magnitude diagram (CMD) morphology, and colour-magnitude filters, for high contrast stellar radial density profiles (RDPs). Results. Based on properties derived from field-star decontaminated CMDs, and structural parameters from RDPs, we find that Pismis 12, IC 1434, Juchert 10, Ruprecht 30, NGC 3519, Herschel 1, Mayer 1, and Muzzio 1 are open clusters with ages within 5Myr−1.3Gyr. Ruprecht 129, 130, 140, and 146 are borderline cases, being rather poorly-populated, with evolutionary sequences and RDPs suggesting star clusters. Dolidze 39, BH 79, and Ruprecht 103, have CMDs and RDPs typical of asterisms. Conclusions. When a low stellar population is associated with a dense field contamination and/or important differential reddening, only a thin line separates star clusters and asterisms. These cases require specific analytical tools to establish their nature. |
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Bica, Eduardo Luiz DamianiBonatto, Charles Jose2014-08-02T02:10:39Z20110004-6361http://hdl.handle.net/10183/99043000898921Context. Poorly-populated star clusters may have photometric and structural properties not much different from asterisms, to the point that, in some cases, widely-used databases present conflicting classifications. Aims. We investigate the nature of a sample of challenging targets that have been classified either as star clusters or asterisms in different studies. A few objects are studied for the first time. Methods. The analysis employs 2MASS photometry, field-star decontamination, to enhance the intrinsic colour–magnitude diagram (CMD) morphology, and colour-magnitude filters, for high contrast stellar radial density profiles (RDPs). Results. Based on properties derived from field-star decontaminated CMDs, and structural parameters from RDPs, we find that Pismis 12, IC 1434, Juchert 10, Ruprecht 30, NGC 3519, Herschel 1, Mayer 1, and Muzzio 1 are open clusters with ages within 5Myr−1.3Gyr. Ruprecht 129, 130, 140, and 146 are borderline cases, being rather poorly-populated, with evolutionary sequences and RDPs suggesting star clusters. Dolidze 39, BH 79, and Ruprecht 103, have CMDs and RDPs typical of asterisms. Conclusions. When a low stellar population is associated with a dense field contamination and/or important differential reddening, only a thin line separates star clusters and asterisms. These cases require specific analytical tools to establish their nature.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 530 (June 2011), A32, 11 p.Fotometria astronômicaAglomerados estelaresDinamica estelarOpen clusters and associations: generalGalaxy: structureStar clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targetsEstrangeiroinfo: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:UFRGSORIGINAL000898921.pdf000898921.pdfTexto completo (inglês)application/pdf1928720http://www.lume.ufrgs.br/bitstream/10183/99043/1/000898921.pdf3ab99755960fb6fa0e592c91a218c4e8MD51TEXT000898921.pdf.txt000898921.pdf.txtExtracted Texttext/plain42115http://www.lume.ufrgs.br/bitstream/10183/99043/2/000898921.pdf.txt1db589baf0f79a263fd26565d6a3e8caMD52THUMBNAIL000898921.pdf.jpg000898921.pdf.jpgGenerated Thumbnailimage/jpeg2021http://www.lume.ufrgs.br/bitstream/10183/99043/3/000898921.pdf.jpg2ed1c07626448bf1cedb6fdb5d89dbf7MD5310183/990432023-07-15 03:27:47.120096oai:www.lume.ufrgs.br:10183/99043Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:27:47Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets |
title |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets |
spellingShingle |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets Bica, Eduardo Luiz Damiani Fotometria astronômica Aglomerados estelares Dinamica estelar Open clusters and associations: general Galaxy: structure |
title_short |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets |
title_full |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets |
title_fullStr |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets |
title_full_unstemmed |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets |
title_sort |
Star clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets |
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 |
Fotometria astronômica Aglomerados estelares Dinamica estelar |
topic |
Fotometria astronômica Aglomerados estelares Dinamica estelar Open clusters and associations: general Galaxy: structure |
dc.subject.eng.fl_str_mv |
Open clusters and associations: general Galaxy: structure |
description |
Context. Poorly-populated star clusters may have photometric and structural properties not much different from asterisms, to the point that, in some cases, widely-used databases present conflicting classifications. Aims. We investigate the nature of a sample of challenging targets that have been classified either as star clusters or asterisms in different studies. A few objects are studied for the first time. Methods. The analysis employs 2MASS photometry, field-star decontamination, to enhance the intrinsic colour–magnitude diagram (CMD) morphology, and colour-magnitude filters, for high contrast stellar radial density profiles (RDPs). Results. Based on properties derived from field-star decontaminated CMDs, and structural parameters from RDPs, we find that Pismis 12, IC 1434, Juchert 10, Ruprecht 30, NGC 3519, Herschel 1, Mayer 1, and Muzzio 1 are open clusters with ages within 5Myr−1.3Gyr. Ruprecht 129, 130, 140, and 146 are borderline cases, being rather poorly-populated, with evolutionary sequences and RDPs suggesting star clusters. Dolidze 39, BH 79, and Ruprecht 103, have CMDs and RDPs typical of asterisms. Conclusions. When a low stellar population is associated with a dense field contamination and/or important differential reddening, only a thin line separates star clusters and asterisms. These cases require specific analytical tools to establish their nature. |
publishDate |
2011 |
dc.date.issued.fl_str_mv |
2011 |
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2014-08-02T02:10:39Z |
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Astronomy and astrophysics. Les Ulis. Vol. 530 (June 2011), A32, 11 p. |
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