The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS
Autor(a) principal: | |
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Data de Publicação: | 2001 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/108236 |
Resumo: | We present a Hubble Space Telescope study of the metal-rich globular cluster NGC 6553 using WFPC2, NICMOS, and STIS. Our primary motivation is to calibrate the STIS broadband LP magnitude against V555 and I814 magnitudes for stars of known metallicity and absolute (visual) magnitude, for application to our study of LMC globular clusters. NGC 6553 has been shown in earlier studies to have a very unusual color-magnitude diagram, so we also use our data to investigate the reddening, distance, luminosity function, and structure of this cluster. We deduce a higher metallicity and smaller distance modulus than did some previous studies, but we emphasize that very large patchy extinction on small angular scales prohibits accurate determination of the parameters of this cluster. The horizontal branch of NGC 6553 in (V,V−I) is tilted at an angle close to that of the reddening vector. We show that extinction does not, however, explain the tilt, which is presumably a metallicity eect. The colormagnitude diagram shows an apparent second turno some 1.5 mag fainter than that of the cluster. We show that this is most likely the background Galactic bulge: however, in that case, the color-magnitude diagram of NGC 6553 is not a good match to that of the field bulge population. The cluster is probably more metal-rich than is the mean Ðeld bulge star. |
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Beaulieu, Sylvie F.Gilmore, Gerard FitzgeraldElson, Rebecca A.W.Johnson, Rachel A.Santiago, Basilio XavierSigurdsson, SteinnTanvir, Nial R.2014-12-13T02:18:02Z20010004-6256http://hdl.handle.net/10183/108236000292171We present a Hubble Space Telescope study of the metal-rich globular cluster NGC 6553 using WFPC2, NICMOS, and STIS. Our primary motivation is to calibrate the STIS broadband LP magnitude against V555 and I814 magnitudes for stars of known metallicity and absolute (visual) magnitude, for application to our study of LMC globular clusters. NGC 6553 has been shown in earlier studies to have a very unusual color-magnitude diagram, so we also use our data to investigate the reddening, distance, luminosity function, and structure of this cluster. We deduce a higher metallicity and smaller distance modulus than did some previous studies, but we emphasize that very large patchy extinction on small angular scales prohibits accurate determination of the parameters of this cluster. The horizontal branch of NGC 6553 in (V,V−I) is tilted at an angle close to that of the reddening vector. We show that extinction does not, however, explain the tilt, which is presumably a metallicity eect. The colormagnitude diagram shows an apparent second turno some 1.5 mag fainter than that of the cluster. We show that this is most likely the background Galactic bulge: however, in that case, the color-magnitude diagram of NGC 6553 is not a good match to that of the field bulge population. The cluster is probably more metal-rich than is the mean Ðeld bulge star.application/pdfengThe Astronomical journal. Chicago. Vol. 121, no. 5 (May 2001), p. 2618-2637Fotometria astronômicaAglomerados estelares globularesAstronomia infravermelhaCosmic raysGalaxies : luminosity function, mass functionGlobular clusters : generalGlobular clusters : individual (NGC 6553)The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOSEstrangeiroinfo: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:UFRGSORIGINAL000292171.pdf000292171.pdfTexto completo (inglês)application/pdf9920151http://www.lume.ufrgs.br/bitstream/10183/108236/1/000292171.pdfbfe34d8baaa3c6721ba616e4a90b92bfMD51TEXT000292171.pdf.txt000292171.pdf.txtExtracted Texttext/plain65665http://www.lume.ufrgs.br/bitstream/10183/108236/2/000292171.pdf.txt0622f138b1c37cf96cf8dea0ea5d9d52MD52THUMBNAIL000292171.pdf.jpg000292171.pdf.jpgGenerated Thumbnailimage/jpeg2169http://www.lume.ufrgs.br/bitstream/10183/108236/3/000292171.pdf.jpgcd4702d9fb627e5a82ff154d3f9b707dMD5310183/1082362023-07-04 03:50:28.272255oai:www.lume.ufrgs.br:10183/108236Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-04T06:50:28Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS |
title |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS |
spellingShingle |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS Beaulieu, Sylvie F. Fotometria astronômica Aglomerados estelares globulares Astronomia infravermelha Cosmic rays Galaxies : luminosity function, mass function Globular clusters : general Globular clusters : individual (NGC 6553) |
title_short |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS |
title_full |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS |
title_fullStr |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS |
title_full_unstemmed |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS |
title_sort |
The metal-rich globular cluster NGC 6553 : observations with WFPC2, STIS, and NICMOS |
author |
Beaulieu, Sylvie F. |
author_facet |
Beaulieu, Sylvie F. Gilmore, Gerard Fitzgerald Elson, Rebecca A.W. Johnson, Rachel A. Santiago, Basilio Xavier Sigurdsson, Steinn Tanvir, Nial R. |
author_role |
author |
author2 |
Gilmore, Gerard Fitzgerald Elson, Rebecca A.W. Johnson, Rachel A. Santiago, Basilio Xavier Sigurdsson, Steinn Tanvir, Nial R. |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Beaulieu, Sylvie F. Gilmore, Gerard Fitzgerald Elson, Rebecca A.W. Johnson, Rachel A. Santiago, Basilio Xavier Sigurdsson, Steinn Tanvir, Nial R. |
dc.subject.por.fl_str_mv |
Fotometria astronômica Aglomerados estelares globulares Astronomia infravermelha |
topic |
Fotometria astronômica Aglomerados estelares globulares Astronomia infravermelha Cosmic rays Galaxies : luminosity function, mass function Globular clusters : general Globular clusters : individual (NGC 6553) |
dc.subject.eng.fl_str_mv |
Cosmic rays Galaxies : luminosity function, mass function Globular clusters : general Globular clusters : individual (NGC 6553) |
description |
We present a Hubble Space Telescope study of the metal-rich globular cluster NGC 6553 using WFPC2, NICMOS, and STIS. Our primary motivation is to calibrate the STIS broadband LP magnitude against V555 and I814 magnitudes for stars of known metallicity and absolute (visual) magnitude, for application to our study of LMC globular clusters. NGC 6553 has been shown in earlier studies to have a very unusual color-magnitude diagram, so we also use our data to investigate the reddening, distance, luminosity function, and structure of this cluster. We deduce a higher metallicity and smaller distance modulus than did some previous studies, but we emphasize that very large patchy extinction on small angular scales prohibits accurate determination of the parameters of this cluster. The horizontal branch of NGC 6553 in (V,V−I) is tilted at an angle close to that of the reddening vector. We show that extinction does not, however, explain the tilt, which is presumably a metallicity eect. The colormagnitude diagram shows an apparent second turno some 1.5 mag fainter than that of the cluster. We show that this is most likely the background Galactic bulge: however, in that case, the color-magnitude diagram of NGC 6553 is not a good match to that of the field bulge population. The cluster is probably more metal-rich than is the mean Ðeld bulge star. |
publishDate |
2001 |
dc.date.issued.fl_str_mv |
2001 |
dc.date.accessioned.fl_str_mv |
2014-12-13T02:18:02Z |
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article |
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http://hdl.handle.net/10183/108236 |
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0004-6256 |
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000292171 |
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http://hdl.handle.net/10183/108236 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The Astronomical journal. Chicago. Vol. 121, no. 5 (May 2001), p. 2618-2637 |
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openAccess |
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