Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/165000 |
Resumo: | We present wide-field JHKS photometry of 16 Galactic globular clusters located towards the Galactic bulge, calibrated on the Two Micron All-Sky Survey photometric system. Differential reddening corrections and statistical field star decontamination are employed for all of these clusters before fitting fiducial sequences to the cluster red giant branches (RGBs). Observed values and uncertainties are reported for several photometric features, including the magnitude of the RGB bump, tip, the horizontal branch (HB) and the slope of the upper RGB. The latest spectroscopically determined chemical abundances are used to build distance- and reddening-independent relations between observed photometric features and cluster metallicity, optimizing the sample size and metallicity baseline of these relations by supplementing our sample with results from the literature.We find that the magnitude difference between the HB and the RGB bump can be used to predict metallicities, in terms of both iron abundance [Fe/H] and global metallicity [M/H], with a precision of better than 0.1 dex in all three near-IR bandpasses for relatively metal-rich ([M/H] −1) clusters. Meanwhile, both the slope of the upper RGB and the magnitude difference between the RGB tip and bump are useful metallicity indicators over the entire sampled metallicity range (−2 [M/H] 0) with a precision of 0.2 dex or better, despite model predictions that the RGB slope may become unreliable at high (near-solar) metallicities. Our results agree with previous calibrations in light of the relevant uncertainties, and we discuss implications for clusters with controversial metallicities as well as directions for further investigation. |
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Cohen, RogerMoni Bidin, ChristianMauro, FrancescoBonatto, Charles JoseGeisler, Doug2017-08-09T02:37:06Z20170035-8711http://hdl.handle.net/10183/165000001021497We present wide-field JHKS photometry of 16 Galactic globular clusters located towards the Galactic bulge, calibrated on the Two Micron All-Sky Survey photometric system. Differential reddening corrections and statistical field star decontamination are employed for all of these clusters before fitting fiducial sequences to the cluster red giant branches (RGBs). Observed values and uncertainties are reported for several photometric features, including the magnitude of the RGB bump, tip, the horizontal branch (HB) and the slope of the upper RGB. The latest spectroscopically determined chemical abundances are used to build distance- and reddening-independent relations between observed photometric features and cluster metallicity, optimizing the sample size and metallicity baseline of these relations by supplementing our sample with results from the literature.We find that the magnitude difference between the HB and the RGB bump can be used to predict metallicities, in terms of both iron abundance [Fe/H] and global metallicity [M/H], with a precision of better than 0.1 dex in all three near-IR bandpasses for relatively metal-rich ([M/H] −1) clusters. Meanwhile, both the slope of the upper RGB and the magnitude difference between the RGB tip and bump are useful metallicity indicators over the entire sampled metallicity range (−2 [M/H] 0) with a precision of 0.2 dex or better, despite model predictions that the RGB slope may become unreliable at high (near-solar) metallicities. Our results agree with previous calibrations in light of the relevant uncertainties, and we discuss implications for clusters with controversial metallicities as well as directions for further investigation.application/pdfengMonthly notices of the Royal Astronomical Society. Oxford. Vol. 464, no. 2 (Jan. 2017), p. 1874-1902Aglomerados globularesBojos de galaxiasFotometria astronômicaMetalicidadeGlobular clustersGeneral – infraredStarsNear-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicatorsEstrangeiroinfo: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:UFRGSORIGINAL001021497.pdf001021497.pdfTexto completo (inglês)application/pdf8717166http://www.lume.ufrgs.br/bitstream/10183/165000/1/001021497.pdff98c923f594a480999a450d1c9ceb1e6MD51TEXT001021497.pdf.txt001021497.pdf.txtExtracted Texttext/plain142964http://www.lume.ufrgs.br/bitstream/10183/165000/2/001021497.pdf.txt93816a9a3a51cace91c3c18365168e97MD52THUMBNAIL001021497.pdf.jpg001021497.pdf.jpgGenerated Thumbnailimage/jpeg2089http://www.lume.ufrgs.br/bitstream/10183/165000/3/001021497.pdf.jpgbefe6879ccc14f69c4648c4755155161MD5310183/1650002023-07-15 03:28:50.385484oai:www.lume.ufrgs.br:10183/165000Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-15T06:28:50Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators |
title |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators |
spellingShingle |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators Cohen, Roger Aglomerados globulares Bojos de galaxias Fotometria astronômica Metalicidade Globular clusters General – infrared Stars |
title_short |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators |
title_full |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators |
title_fullStr |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators |
title_full_unstemmed |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators |
title_sort |
Near-infrared photometry of globular clusters towards the Galactic bulge : observations and photometric metallicity indicators |
author |
Cohen, Roger |
author_facet |
Cohen, Roger Moni Bidin, Christian Mauro, Francesco Bonatto, Charles Jose Geisler, Doug |
author_role |
author |
author2 |
Moni Bidin, Christian Mauro, Francesco Bonatto, Charles Jose Geisler, Doug |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Cohen, Roger Moni Bidin, Christian Mauro, Francesco Bonatto, Charles Jose Geisler, Doug |
dc.subject.por.fl_str_mv |
Aglomerados globulares Bojos de galaxias Fotometria astronômica Metalicidade |
topic |
Aglomerados globulares Bojos de galaxias Fotometria astronômica Metalicidade Globular clusters General – infrared Stars |
dc.subject.eng.fl_str_mv |
Globular clusters General – infrared Stars |
description |
We present wide-field JHKS photometry of 16 Galactic globular clusters located towards the Galactic bulge, calibrated on the Two Micron All-Sky Survey photometric system. Differential reddening corrections and statistical field star decontamination are employed for all of these clusters before fitting fiducial sequences to the cluster red giant branches (RGBs). Observed values and uncertainties are reported for several photometric features, including the magnitude of the RGB bump, tip, the horizontal branch (HB) and the slope of the upper RGB. The latest spectroscopically determined chemical abundances are used to build distance- and reddening-independent relations between observed photometric features and cluster metallicity, optimizing the sample size and metallicity baseline of these relations by supplementing our sample with results from the literature.We find that the magnitude difference between the HB and the RGB bump can be used to predict metallicities, in terms of both iron abundance [Fe/H] and global metallicity [M/H], with a precision of better than 0.1 dex in all three near-IR bandpasses for relatively metal-rich ([M/H] −1) clusters. Meanwhile, both the slope of the upper RGB and the magnitude difference between the RGB tip and bump are useful metallicity indicators over the entire sampled metallicity range (−2 [M/H] 0) with a precision of 0.2 dex or better, despite model predictions that the RGB slope may become unreliable at high (near-solar) metallicities. Our results agree with previous calibrations in light of the relevant uncertainties, and we discuss implications for clusters with controversial metallicities as well as directions for further investigation. |
publishDate |
2017 |
dc.date.accessioned.fl_str_mv |
2017-08-09T02:37:06Z |
dc.date.issued.fl_str_mv |
2017 |
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http://hdl.handle.net/10183/165000 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the Royal Astronomical Society. Oxford. Vol. 464, no. 2 (Jan. 2017), p. 1874-1902 |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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