NGC 2180 : a disrupting open cluster?
Main Author: | |
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Publication Date: | 2004 |
Other Authors: | , |
Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UFRGS |
Download full: | http://hdl.handle.net/10183/98530 |
Summary: | The spatial dependence of luminosity and mass functions of evolved open clusters is discussed in this work using J and H 2MASS photometry, which allows a wide spatial coverage and proper background determination. The target objects are the intermediate-age open cluster NGC3680 (l = 286.76° and b = 16.92°), which has been reported as being in an advanced state of dissolution, and NGC2180 (l = 203.85°, b = −7.01°), a possible dynamically evolved open cluster. At the 1 − σ level, NGC2180 presents a radial distribution of stars that can be represented by a King law. We conclude that, although in an advanced dynamical state (mass segregated), NGC3680 does not present strong signs of dissolution, having luminosity and mass functions very similar to those of the τage ≈ 3.2 Gyr open cluster M67. On the other hand, NGC2180 appears to have flat, eroded luminosity functions throughout its structure, suggesting that in addition to mass segregation, Galactic tidal stripping has been effective in depleting this object. Accordingly, NGC2180 may be the missing link between evolved open clusters and remnants. For NGC 2180 we infer a distance to the Sun dʘ = 0.91 ± 0.15 kpc, an age τage ≈ 710 Myr and an observed stellar mass of mobs ∼ 47 Mʘ. For NGC3680 we derive an age τage ≈ 1.6 Gyr, E(B − V) = 0.0 and dʘ = 1.00 ± 0.09 kpc, confirming previous estimates. The observed stellar mass mobs ≈ 130 Mʘ agrees with previous values. We study both clusters in the context of dynamical states estimated from diagnostic diagrams involving photometric and structural parameters. Both objects appear to be dynamically evolved systems. In particular, NGC2180 is closer to open cluster remnants than NGC3680. |
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Bonatto, Charles JoseBica, Eduardo Luiz DamianiPavani, Daniela Borges2014-07-24T02:04:30Z20040004-6361http://hdl.handle.net/10183/98530000459295The spatial dependence of luminosity and mass functions of evolved open clusters is discussed in this work using J and H 2MASS photometry, which allows a wide spatial coverage and proper background determination. The target objects are the intermediate-age open cluster NGC3680 (l = 286.76° and b = 16.92°), which has been reported as being in an advanced state of dissolution, and NGC2180 (l = 203.85°, b = −7.01°), a possible dynamically evolved open cluster. At the 1 − σ level, NGC2180 presents a radial distribution of stars that can be represented by a King law. We conclude that, although in an advanced dynamical state (mass segregated), NGC3680 does not present strong signs of dissolution, having luminosity and mass functions very similar to those of the τage ≈ 3.2 Gyr open cluster M67. On the other hand, NGC2180 appears to have flat, eroded luminosity functions throughout its structure, suggesting that in addition to mass segregation, Galactic tidal stripping has been effective in depleting this object. Accordingly, NGC2180 may be the missing link between evolved open clusters and remnants. For NGC 2180 we infer a distance to the Sun dʘ = 0.91 ± 0.15 kpc, an age τage ≈ 710 Myr and an observed stellar mass of mobs ∼ 47 Mʘ. For NGC3680 we derive an age τage ≈ 1.6 Gyr, E(B − V) = 0.0 and dʘ = 1.00 ± 0.09 kpc, confirming previous estimates. The observed stellar mass mobs ≈ 130 Mʘ agrees with previous values. We study both clusters in the context of dynamical states estimated from diagnostic diagrams involving photometric and structural parameters. Both objects appear to be dynamically evolved systems. In particular, NGC2180 is closer to open cluster remnants than NGC3680.application/pdfengAstronomy and astrophysics. Vol. 427, no. 2 (Nov. 2004), p. 485-494AstronomiaGalaxiaAglomerados estelaresDinamica estelarFotometria estelarRadiação estelarEstrutura estelarGalaxy: open clusters and associations: generalStars: luminosity function, mass functionNGC 2180 : a disrupting open cluster?Estrangeiroinfo: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:UFRGSORIGINAL000459295.pdf000459295.pdfTexto completo (inglês)application/pdf542146http://www.lume.ufrgs.br/bitstream/10183/98530/1/000459295.pdf5f52fc06d1016d185fb1ee4cd81618d2MD51TEXT000459295.pdf.txt000459295.pdf.txtExtracted Texttext/plain46815http://www.lume.ufrgs.br/bitstream/10183/98530/2/000459295.pdf.txte62435c68278f5a658f1049084a48642MD52THUMBNAIL000459295.pdf.jpg000459295.pdf.jpgGenerated Thumbnailimage/jpeg1933http://www.lume.ufrgs.br/bitstream/10183/98530/3/000459295.pdf.jpgd7b9f16606d3a638425d141c8b826647MD5310183/985302023-07-15 03:27:37.875807oai:www.lume.ufrgs.br:10183/98530Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:27:37Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
NGC 2180 : a disrupting open cluster? |
title |
NGC 2180 : a disrupting open cluster? |
spellingShingle |
NGC 2180 : a disrupting open cluster? Bonatto, Charles Jose Astronomia Galaxia Aglomerados estelares Dinamica estelar Fotometria estelar Radiação estelar Estrutura estelar Galaxy: open clusters and associations: general Stars: luminosity function, mass function |
title_short |
NGC 2180 : a disrupting open cluster? |
title_full |
NGC 2180 : a disrupting open cluster? |
title_fullStr |
NGC 2180 : a disrupting open cluster? |
title_full_unstemmed |
NGC 2180 : a disrupting open cluster? |
title_sort |
NGC 2180 : a disrupting open cluster? |
author |
Bonatto, Charles Jose |
author_facet |
Bonatto, Charles Jose Bica, Eduardo Luiz Damiani Pavani, Daniela Borges |
author_role |
author |
author2 |
Bica, Eduardo Luiz Damiani Pavani, Daniela Borges |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Bonatto, Charles Jose Bica, Eduardo Luiz Damiani Pavani, Daniela Borges |
dc.subject.por.fl_str_mv |
Astronomia Galaxia Aglomerados estelares Dinamica estelar Fotometria estelar Radiação estelar Estrutura estelar |
topic |
Astronomia Galaxia Aglomerados estelares Dinamica estelar Fotometria estelar Radiação estelar Estrutura estelar Galaxy: open clusters and associations: general Stars: luminosity function, mass function |
dc.subject.eng.fl_str_mv |
Galaxy: open clusters and associations: general Stars: luminosity function, mass function |
description |
The spatial dependence of luminosity and mass functions of evolved open clusters is discussed in this work using J and H 2MASS photometry, which allows a wide spatial coverage and proper background determination. The target objects are the intermediate-age open cluster NGC3680 (l = 286.76° and b = 16.92°), which has been reported as being in an advanced state of dissolution, and NGC2180 (l = 203.85°, b = −7.01°), a possible dynamically evolved open cluster. At the 1 − σ level, NGC2180 presents a radial distribution of stars that can be represented by a King law. We conclude that, although in an advanced dynamical state (mass segregated), NGC3680 does not present strong signs of dissolution, having luminosity and mass functions very similar to those of the τage ≈ 3.2 Gyr open cluster M67. On the other hand, NGC2180 appears to have flat, eroded luminosity functions throughout its structure, suggesting that in addition to mass segregation, Galactic tidal stripping has been effective in depleting this object. Accordingly, NGC2180 may be the missing link between evolved open clusters and remnants. For NGC 2180 we infer a distance to the Sun dʘ = 0.91 ± 0.15 kpc, an age τage ≈ 710 Myr and an observed stellar mass of mobs ∼ 47 Mʘ. For NGC3680 we derive an age τage ≈ 1.6 Gyr, E(B − V) = 0.0 and dʘ = 1.00 ± 0.09 kpc, confirming previous estimates. The observed stellar mass mobs ≈ 130 Mʘ agrees with previous values. We study both clusters in the context of dynamical states estimated from diagnostic diagrams involving photometric and structural parameters. Both objects appear to be dynamically evolved systems. In particular, NGC2180 is closer to open cluster remnants than NGC3680. |
publishDate |
2004 |
dc.date.issued.fl_str_mv |
2004 |
dc.date.accessioned.fl_str_mv |
2014-07-24T02:04:30Z |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Vol. 427, no. 2 (Nov. 2004), p. 485-494 |
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