Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108042 |
Resumo: | We combine archival Hubble Space Telescope imaging with wide-field near-infrared photometry to study the neglected metal-poor Galactic globular cluster NGC 6544. A high spatial resolution map of differential reddening over the inner portion of the cluster is constructed, revealing variations of up to half of the total reddening, and the resulting corrected color–magnitude diagrams reveal a sparse blue horizontal branch and centrally concentrated blue straggler population, verified via relative proper motions. Using the corrected photometry to investigate the cluster distance, reddening, and age via direct comparison to well-calibrated photometry of clusters with similar metallicities, we estimate (m − M)0 = 11.96, E(B − V ) = 0.79, and an age coeval with M13 to within the relevant uncertainties. Although our data are insufficient to place tight constraints on the reddening law toward NGC6544, we find no strong evidence that it is non-standard at optical or near-infraredwavelengths.We also provide near-infrared fiducial sequences extending nearly 2 mag below the cluster main sequence turnoff, generated from a statistically decontaminated sample of cluster stars. Lastly, we redetermine the cluster center and construct a radial number density profile which is well fit by an atypically flat power law with a slope of about 1.7. We discuss this result, together with a flattened main sequence luminosity function and inverted mass function, in the context of mass segregation and tidal stripping via interactions with Milky Way potential. |
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Cohen, RogerMauro, FrancescoGeisler, DougMoni Bidin, ChristianDotter, Aaron LoverenBonatto, Charles Jose2014-12-11T02:15:59Z20140004-6256http://hdl.handle.net/10183/108042000943284We combine archival Hubble Space Telescope imaging with wide-field near-infrared photometry to study the neglected metal-poor Galactic globular cluster NGC 6544. A high spatial resolution map of differential reddening over the inner portion of the cluster is constructed, revealing variations of up to half of the total reddening, and the resulting corrected color–magnitude diagrams reveal a sparse blue horizontal branch and centrally concentrated blue straggler population, verified via relative proper motions. Using the corrected photometry to investigate the cluster distance, reddening, and age via direct comparison to well-calibrated photometry of clusters with similar metallicities, we estimate (m − M)0 = 11.96, E(B − V ) = 0.79, and an age coeval with M13 to within the relevant uncertainties. Although our data are insufficient to place tight constraints on the reddening law toward NGC6544, we find no strong evidence that it is non-standard at optical or near-infraredwavelengths.We also provide near-infrared fiducial sequences extending nearly 2 mag below the cluster main sequence turnoff, generated from a statistically decontaminated sample of cluster stars. Lastly, we redetermine the cluster center and construct a radial number density profile which is well fit by an atypically flat power law with a slope of about 1.7. We discuss this result, together with a flattened main sequence luminosity function and inverted mass function, in the context of mass segregation and tidal stripping via interactions with Milky Way potential.application/pdfengThe Astronomical journal. Bristol. Vol. 148, no. 1 (July 2014), 18, 24 p.GalaxiaAglomerados estelares globularesFotometria astronômicaGalaxy: evolutionGlobular clusters: generalGlobular clusters: individual (NGC 6544)Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope studyEstrangeiroinfo: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:UFRGSORIGINAL000943284.pdf000943284.pdfTexto completo (inglês)application/pdf16964676http://www.lume.ufrgs.br/bitstream/10183/108042/1/000943284.pdfc07eec182be7f847513bcc40f7e83d26MD51TEXT000943284.pdf.txt000943284.pdf.txtExtracted Texttext/plain124288http://www.lume.ufrgs.br/bitstream/10183/108042/2/000943284.pdf.txt9c953c20d874b422fb502a5030155b6cMD52THUMBNAIL000943284.pdf.jpg000943284.pdf.jpgGenerated Thumbnailimage/jpeg2132http://www.lume.ufrgs.br/bitstream/10183/108042/3/000943284.pdf.jpgcb616aabc9aa95210e67a8827e731160MD5310183/1080422023-07-15 03:28:33.972765oai:www.lume.ufrgs.br:10183/108042Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:28:33Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study |
title |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study |
spellingShingle |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study Cohen, Roger Galaxia Aglomerados estelares globulares Fotometria astronômica Galaxy: evolution Globular clusters: general Globular clusters: individual (NGC 6544) |
title_short |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study |
title_full |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study |
title_fullStr |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study |
title_full_unstemmed |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study |
title_sort |
Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study |
author |
Cohen, Roger |
author_facet |
Cohen, Roger Mauro, Francesco Geisler, Doug Moni Bidin, Christian Dotter, Aaron Loveren Bonatto, Charles Jose |
author_role |
author |
author2 |
Mauro, Francesco Geisler, Doug Moni Bidin, Christian Dotter, Aaron Loveren Bonatto, Charles Jose |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Cohen, Roger Mauro, Francesco Geisler, Doug Moni Bidin, Christian Dotter, Aaron Loveren Bonatto, Charles Jose |
dc.subject.por.fl_str_mv |
Galaxia Aglomerados estelares globulares Fotometria astronômica |
topic |
Galaxia Aglomerados estelares globulares Fotometria astronômica Galaxy: evolution Globular clusters: general Globular clusters: individual (NGC 6544) |
dc.subject.eng.fl_str_mv |
Galaxy: evolution Globular clusters: general Globular clusters: individual (NGC 6544) |
description |
We combine archival Hubble Space Telescope imaging with wide-field near-infrared photometry to study the neglected metal-poor Galactic globular cluster NGC 6544. A high spatial resolution map of differential reddening over the inner portion of the cluster is constructed, revealing variations of up to half of the total reddening, and the resulting corrected color–magnitude diagrams reveal a sparse blue horizontal branch and centrally concentrated blue straggler population, verified via relative proper motions. Using the corrected photometry to investigate the cluster distance, reddening, and age via direct comparison to well-calibrated photometry of clusters with similar metallicities, we estimate (m − M)0 = 11.96, E(B − V ) = 0.79, and an age coeval with M13 to within the relevant uncertainties. Although our data are insufficient to place tight constraints on the reddening law toward NGC6544, we find no strong evidence that it is non-standard at optical or near-infraredwavelengths.We also provide near-infrared fiducial sequences extending nearly 2 mag below the cluster main sequence turnoff, generated from a statistically decontaminated sample of cluster stars. Lastly, we redetermine the cluster center and construct a radial number density profile which is well fit by an atypically flat power law with a slope of about 1.7. We discuss this result, together with a flattened main sequence luminosity function and inverted mass function, in the context of mass segregation and tidal stripping via interactions with Milky Way potential. |
publishDate |
2014 |
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2014-12-11T02:15:59Z |
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2014 |
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dc.relation.ispartof.pt_BR.fl_str_mv |
The Astronomical journal. Bristol. Vol. 148, no. 1 (July 2014), 18, 24 p. |
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openAccess |
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