VLT-UVES analysis of 5 giants in 47 Tucanae
Autor(a) principal: | |
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Data de Publicação: | 2005 |
Outros Autores: | , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/98772 |
Resumo: | High resolution spectra of 5 giants, including a horizontal branch star, of the metal-rich globular cluster 47 Tucanae were obtained with the UVES spectrograph at the 8m VLT UT2-Kueyen telescope. The atmospheric parameters (Teff, log g, [Fe/H], vt) were derived from VIJK photometry and spectroscopic data based on Fe I and Fe II lines. Fe I and Fe II iron abundances and respective total errors [Fe I/H] = –0.66 ± 0.12 and [Fe II/H] = –0.69 ± 0.24 are found. Abundances of α (O, Mg, Ca, Si, Ti), odd-Z (Na, Al), s- (Ba, La, Zr), and r-process (Eu) elements were determined by means of spectrum synthesis. The main results are [O/Fe] = +0.35 ± 0.11, [Mg/Fe] ≈ [Si/Fe] ≈ [Ti/Fe]=+0.23 ± 0.17, [Ca/Fe] = 0.0 ± 0.15, [Ba/Fe] = +0.31 ± 0.22 and [Eu/Fe] = +0.33 ± 0.10. Overabundances of the α-elements O, Mg, Si and Ti, and of Eu are similar to those seen in halo metal-poor stars, whereas a solar Ca-to-Fe ratio resembles the values found in bulge stars. An overall metallicity Z = 0.006 or [M/H] = –0.45 is thus obtained, as is a mean heliocentric radial velocity vhel r = −22.43 ± 1.99 km sˉ¹. |
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Alves-Brito, AlanBarbuy, BeatrizOrtolani, SergioMomany, YazanHill, VanessaZoccali, ManuelaRenzini, AlvioMinniti, DantePasquini, LucaBica, Eduardo Luiz DamianiRich, Robert Michael2014-07-26T02:09:20Z20050004-6361http://hdl.handle.net/10183/98772000536728High resolution spectra of 5 giants, including a horizontal branch star, of the metal-rich globular cluster 47 Tucanae were obtained with the UVES spectrograph at the 8m VLT UT2-Kueyen telescope. The atmospheric parameters (Teff, log g, [Fe/H], vt) were derived from VIJK photometry and spectroscopic data based on Fe I and Fe II lines. Fe I and Fe II iron abundances and respective total errors [Fe I/H] = –0.66 ± 0.12 and [Fe II/H] = –0.69 ± 0.24 are found. Abundances of α (O, Mg, Ca, Si, Ti), odd-Z (Na, Al), s- (Ba, La, Zr), and r-process (Eu) elements were determined by means of spectrum synthesis. The main results are [O/Fe] = +0.35 ± 0.11, [Mg/Fe] ≈ [Si/Fe] ≈ [Ti/Fe]=+0.23 ± 0.17, [Ca/Fe] = 0.0 ± 0.15, [Ba/Fe] = +0.31 ± 0.22 and [Eu/Fe] = +0.33 ± 0.10. Overabundances of the α-elements O, Mg, Si and Ti, and of Eu are similar to those seen in halo metal-poor stars, whereas a solar Ca-to-Fe ratio resembles the values found in bulge stars. An overall metallicity Z = 0.006 or [M/H] = –0.45 is thus obtained, as is a mean heliocentric radial velocity vhel r = −22.43 ± 1.99 km sˉ¹.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 435, no. 2 (May 2005), p. 657-667GalaxiaEstrelas gigantesAglomerados globularesFotometria estelarEspectros estelaresGlobular clusters: individual: 47 TucanaeGlobular clusters: generalStars: abundancesVLT-UVES analysis of 5 giants in 47 TucanaeEstrangeiroinfo: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:UFRGSORIGINAL000536728.pdf000536728.pdfTexto completo (inglês)application/pdf2951938http://www.lume.ufrgs.br/bitstream/10183/98772/1/000536728.pdfffccd5e7bae2a0adfca0677be69ecc82MD51TEXT000536728.pdf.txt000536728.pdf.txtExtracted Texttext/plain45996http://www.lume.ufrgs.br/bitstream/10183/98772/2/000536728.pdf.txt2067f0c74ab6e0f4afd46d5196896edcMD52THUMBNAIL000536728.pdf.jpg000536728.pdf.jpgGenerated Thumbnailimage/jpeg2052http://www.lume.ufrgs.br/bitstream/10183/98772/3/000536728.pdf.jpg435c023d4316f76275241491a7601aa4MD5310183/987722023-05-14 03:24:31.704052oai:www.lume.ufrgs.br:10183/98772Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-05-14T06:24:31Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
VLT-UVES analysis of 5 giants in 47 Tucanae |
title |
VLT-UVES analysis of 5 giants in 47 Tucanae |
spellingShingle |
VLT-UVES analysis of 5 giants in 47 Tucanae Alves-Brito, Alan Galaxia Estrelas gigantes Aglomerados globulares Fotometria estelar Espectros estelares Globular clusters: individual: 47 Tucanae Globular clusters: general Stars: abundances |
title_short |
VLT-UVES analysis of 5 giants in 47 Tucanae |
title_full |
VLT-UVES analysis of 5 giants in 47 Tucanae |
title_fullStr |
VLT-UVES analysis of 5 giants in 47 Tucanae |
title_full_unstemmed |
VLT-UVES analysis of 5 giants in 47 Tucanae |
title_sort |
VLT-UVES analysis of 5 giants in 47 Tucanae |
author |
Alves-Brito, Alan |
author_facet |
Alves-Brito, Alan Barbuy, Beatriz Ortolani, Sergio Momany, Yazan Hill, Vanessa Zoccali, Manuela Renzini, Alvio Minniti, Dante Pasquini, Luca Bica, Eduardo Luiz Damiani Rich, Robert Michael |
author_role |
author |
author2 |
Barbuy, Beatriz Ortolani, Sergio Momany, Yazan Hill, Vanessa Zoccali, Manuela Renzini, Alvio Minniti, Dante Pasquini, Luca Bica, Eduardo Luiz Damiani Rich, Robert Michael |
author2_role |
author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Alves-Brito, Alan Barbuy, Beatriz Ortolani, Sergio Momany, Yazan Hill, Vanessa Zoccali, Manuela Renzini, Alvio Minniti, Dante Pasquini, Luca Bica, Eduardo Luiz Damiani Rich, Robert Michael |
dc.subject.por.fl_str_mv |
Galaxia Estrelas gigantes Aglomerados globulares Fotometria estelar Espectros estelares |
topic |
Galaxia Estrelas gigantes Aglomerados globulares Fotometria estelar Espectros estelares Globular clusters: individual: 47 Tucanae Globular clusters: general Stars: abundances |
dc.subject.eng.fl_str_mv |
Globular clusters: individual: 47 Tucanae Globular clusters: general Stars: abundances |
description |
High resolution spectra of 5 giants, including a horizontal branch star, of the metal-rich globular cluster 47 Tucanae were obtained with the UVES spectrograph at the 8m VLT UT2-Kueyen telescope. The atmospheric parameters (Teff, log g, [Fe/H], vt) were derived from VIJK photometry and spectroscopic data based on Fe I and Fe II lines. Fe I and Fe II iron abundances and respective total errors [Fe I/H] = –0.66 ± 0.12 and [Fe II/H] = –0.69 ± 0.24 are found. Abundances of α (O, Mg, Ca, Si, Ti), odd-Z (Na, Al), s- (Ba, La, Zr), and r-process (Eu) elements were determined by means of spectrum synthesis. The main results are [O/Fe] = +0.35 ± 0.11, [Mg/Fe] ≈ [Si/Fe] ≈ [Ti/Fe]=+0.23 ± 0.17, [Ca/Fe] = 0.0 ± 0.15, [Ba/Fe] = +0.31 ± 0.22 and [Eu/Fe] = +0.33 ± 0.10. Overabundances of the α-elements O, Mg, Si and Ti, and of Eu are similar to those seen in halo metal-poor stars, whereas a solar Ca-to-Fe ratio resembles the values found in bulge stars. An overall metallicity Z = 0.006 or [M/H] = –0.45 is thus obtained, as is a mean heliocentric radial velocity vhel r = −22.43 ± 1.99 km sˉ¹. |
publishDate |
2005 |
dc.date.issued.fl_str_mv |
2005 |
dc.date.accessioned.fl_str_mv |
2014-07-26T02:09:20Z |
dc.type.driver.fl_str_mv |
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format |
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dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/98772 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-6361 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000536728 |
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http://hdl.handle.net/10183/98772 |
dc.language.iso.fl_str_mv |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Les Ulis. Vol. 435, no. 2 (May 2005), p. 657-667 |
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info:eu-repo/semantics/openAccess |
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openAccess |
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