The old galactic open cluster FSR 1716 and Czernik 23
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/99029 |
Resumo: | Context. Open clusters older than ~4 Gyr are rare in the Galaxy. Affected by a series of mass-decreasing processes, the stellar content of most open clusters dissolves into the field on a time-scale shorter than ~1 Gyr. In this sense, improving the statistics of old objects may provide constraints for a better understanding of the dynamical dissolution of open clusters. Aims. Our main purpose is to investigate the nature of the globular cluster candidate FSR 1716, located at l = 329.8° and b = −1.6°. We also derive parameters of the anti-centre open cluster Czernik 23 (FSR 834). Both objects have been detected as stellar overdensities in the Froebrich, Scholz & Raftery star cluster candidate catalogue. Methods. The analyses are based on near-infrared colour−magnitude diagrams and stellar radial density profiles. The intrinsic colour−magnitude diagram morphology is enhanced by a field-star decontamination algorithm applied to the 2MASS J, H, and Ks photometry. Results. Isochrone fits indicate that FSR 1716 is more probably an old (~7 Gyr) and absorbed (Av = 6.3 ± 0.2) open cluster, located ≈0.6 kpc inside the solar circle in a contaminated central field. However, we cannot rule out the possibility of a low-mass, loose globular cluster. Czernik 23 is shown to be an almost absorption-free open cluster, ~5 Gyr old, located about 2.5 kpc towards the anticentre. In both cases, solar and sub-solar ([Fe/H] ~ −0.5) metallicity isochrones represent equally well the stellar sequences. Both star clusters have a low mass content (<~200 Mʘ) presently stored in stars. Their relatively small core and cluster radii are comparable to those of other open clusters of similar age. These structural parameters are probably a consequence of the several Gyr of mass loss due to stellar evolution, tidal interactions with the disk (and bulge in the case of FSR 1716), and possibly giant molecular clouds. Conclusions. Czernik 23, and especially FSR 1716, are rare examples of extreme dynamical survivors. The identification of both as such represents an increase of ≈10% in the known population of open clusters older than ~4 Gyr in the Galaxy. |
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Bonatto, Charles JoseBica, Eduardo Luiz Damiani2014-08-01T02:07:12Z20080004-6361http://hdl.handle.net/10183/99029000674138Context. Open clusters older than ~4 Gyr are rare in the Galaxy. Affected by a series of mass-decreasing processes, the stellar content of most open clusters dissolves into the field on a time-scale shorter than ~1 Gyr. In this sense, improving the statistics of old objects may provide constraints for a better understanding of the dynamical dissolution of open clusters. Aims. Our main purpose is to investigate the nature of the globular cluster candidate FSR 1716, located at l = 329.8° and b = −1.6°. We also derive parameters of the anti-centre open cluster Czernik 23 (FSR 834). Both objects have been detected as stellar overdensities in the Froebrich, Scholz & Raftery star cluster candidate catalogue. Methods. The analyses are based on near-infrared colour−magnitude diagrams and stellar radial density profiles. The intrinsic colour−magnitude diagram morphology is enhanced by a field-star decontamination algorithm applied to the 2MASS J, H, and Ks photometry. Results. Isochrone fits indicate that FSR 1716 is more probably an old (~7 Gyr) and absorbed (Av = 6.3 ± 0.2) open cluster, located ≈0.6 kpc inside the solar circle in a contaminated central field. However, we cannot rule out the possibility of a low-mass, loose globular cluster. Czernik 23 is shown to be an almost absorption-free open cluster, ~5 Gyr old, located about 2.5 kpc towards the anticentre. In both cases, solar and sub-solar ([Fe/H] ~ −0.5) metallicity isochrones represent equally well the stellar sequences. Both star clusters have a low mass content (<~200 Mʘ) presently stored in stars. Their relatively small core and cluster radii are comparable to those of other open clusters of similar age. These structural parameters are probably a consequence of the several Gyr of mass loss due to stellar evolution, tidal interactions with the disk (and bulge in the case of FSR 1716), and possibly giant molecular clouds. Conclusions. Czernik 23, and especially FSR 1716, are rare examples of extreme dynamical survivors. The identification of both as such represents an increase of ≈10% in the known population of open clusters older than ~4 Gyr in the Galaxy.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 491, no. 3 (Dec. 2008), p. 767-780Aglomerados abertos e associaçõesGalaxiaAglomerado aberto FSR 1716Aglomerado aberto Czernik 23Sistemas estelaresGalaxy: open clusters and associations: generalGalaxy: open clusters and associations: individual: FSR 1716Galaxy: open clusters and associations: individual: Czernik 23The old galactic open cluster FSR 1716 and Czernik 23Estrangeiroinfo: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:UFRGSORIGINAL000674138.pdf000674138.pdfTexto completo (inglês)application/pdf852866http://www.lume.ufrgs.br/bitstream/10183/99029/1/000674138.pdf3a4f60d64d118feceb036a70b4ebec5cMD51TEXT000674138.pdf.txt000674138.pdf.txtExtracted Texttext/plain75524http://www.lume.ufrgs.br/bitstream/10183/99029/2/000674138.pdf.txt40f814dcb6dffab781539f3d1d1600f0MD52THUMBNAIL000674138.pdf.jpg000674138.pdf.jpgGenerated Thumbnailimage/jpeg1905http://www.lume.ufrgs.br/bitstream/10183/99029/3/000674138.pdf.jpge48ea5a4f8786ca8bbb5989b4e90dbc6MD5310183/990292023-07-15 03:26:35.948662oai:www.lume.ufrgs.br:10183/99029Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:26:35Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The old galactic open cluster FSR 1716 and Czernik 23 |
title |
The old galactic open cluster FSR 1716 and Czernik 23 |
spellingShingle |
The old galactic open cluster FSR 1716 and Czernik 23 Bonatto, Charles Jose Aglomerados abertos e associações Galaxia Aglomerado aberto FSR 1716 Aglomerado aberto Czernik 23 Sistemas estelares Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: FSR 1716 Galaxy: open clusters and associations: individual: Czernik 23 |
title_short |
The old galactic open cluster FSR 1716 and Czernik 23 |
title_full |
The old galactic open cluster FSR 1716 and Czernik 23 |
title_fullStr |
The old galactic open cluster FSR 1716 and Czernik 23 |
title_full_unstemmed |
The old galactic open cluster FSR 1716 and Czernik 23 |
title_sort |
The old galactic open cluster FSR 1716 and Czernik 23 |
author |
Bonatto, Charles Jose |
author_facet |
Bonatto, Charles Jose Bica, Eduardo Luiz Damiani |
author_role |
author |
author2 |
Bica, Eduardo Luiz Damiani |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Bonatto, Charles Jose Bica, Eduardo Luiz Damiani |
dc.subject.por.fl_str_mv |
Aglomerados abertos e associações Galaxia Aglomerado aberto FSR 1716 Aglomerado aberto Czernik 23 Sistemas estelares |
topic |
Aglomerados abertos e associações Galaxia Aglomerado aberto FSR 1716 Aglomerado aberto Czernik 23 Sistemas estelares Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: FSR 1716 Galaxy: open clusters and associations: individual: Czernik 23 |
dc.subject.eng.fl_str_mv |
Galaxy: open clusters and associations: general Galaxy: open clusters and associations: individual: FSR 1716 Galaxy: open clusters and associations: individual: Czernik 23 |
description |
Context. Open clusters older than ~4 Gyr are rare in the Galaxy. Affected by a series of mass-decreasing processes, the stellar content of most open clusters dissolves into the field on a time-scale shorter than ~1 Gyr. In this sense, improving the statistics of old objects may provide constraints for a better understanding of the dynamical dissolution of open clusters. Aims. Our main purpose is to investigate the nature of the globular cluster candidate FSR 1716, located at l = 329.8° and b = −1.6°. We also derive parameters of the anti-centre open cluster Czernik 23 (FSR 834). Both objects have been detected as stellar overdensities in the Froebrich, Scholz & Raftery star cluster candidate catalogue. Methods. The analyses are based on near-infrared colour−magnitude diagrams and stellar radial density profiles. The intrinsic colour−magnitude diagram morphology is enhanced by a field-star decontamination algorithm applied to the 2MASS J, H, and Ks photometry. Results. Isochrone fits indicate that FSR 1716 is more probably an old (~7 Gyr) and absorbed (Av = 6.3 ± 0.2) open cluster, located ≈0.6 kpc inside the solar circle in a contaminated central field. However, we cannot rule out the possibility of a low-mass, loose globular cluster. Czernik 23 is shown to be an almost absorption-free open cluster, ~5 Gyr old, located about 2.5 kpc towards the anticentre. In both cases, solar and sub-solar ([Fe/H] ~ −0.5) metallicity isochrones represent equally well the stellar sequences. Both star clusters have a low mass content (<~200 Mʘ) presently stored in stars. Their relatively small core and cluster radii are comparable to those of other open clusters of similar age. These structural parameters are probably a consequence of the several Gyr of mass loss due to stellar evolution, tidal interactions with the disk (and bulge in the case of FSR 1716), and possibly giant molecular clouds. Conclusions. Czernik 23, and especially FSR 1716, are rare examples of extreme dynamical survivors. The identification of both as such represents an increase of ≈10% in the known population of open clusters older than ~4 Gyr in the Galaxy. |
publishDate |
2008 |
dc.date.issued.fl_str_mv |
2008 |
dc.date.accessioned.fl_str_mv |
2014-08-01T02:07:12Z |
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0004-6361 |
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000674138 |
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eng |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Les Ulis. Vol. 491, no. 3 (Dec. 2008), p. 767-780 |
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