VLT-UVES analysis of 5 giants in 47 Tucanae

A. Alves-Brito, B. Barbuy, S. Ortolani, Y. Momany, V. Hill, M. Zoccali, A. Renzini, D. Minniti, L. Pasquini, E. Bica, R. M. Rich

Resultado de la investigación: Article

47 Citas (Scopus)

Resumen

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 8 m VLT UT2-Kueyen telescope. The atmospheric parameters (Teff, log g, [Fe/H], vt) were derived from VIJK photometry and spectroscopic data based on FeI and FeII lines. FeI and FeII 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 v rhel = -22.43 ± 1.99 kms-1.

Idioma originalEnglish
Páginas (desde-hasta)657-667
Número de páginas11
PublicaciónAstronomy and Astrophysics
Volumen435
N.º2
DOI
EstadoPublished - may 2005

Huella dactilar

horizontal branch stars
stars
metal
globular clusters
radial velocity
metals
spectrographs
metallicity
photometry
halos
telescopes
iron
high resolution
synthesis
analysis
parameter

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Alves-Brito, A., Barbuy, B., Ortolani, S., Momany, Y., Hill, V., Zoccali, M., ... Rich, R. M. (2005). VLT-UVES analysis of 5 giants in 47 Tucanae. Astronomy and Astrophysics, 435(2), 657-667. https://doi.org/10.1051/0004-6361:20041634
Alves-Brito, A. ; Barbuy, B. ; Ortolani, S. ; Momany, Y. ; Hill, V. ; Zoccali, M. ; Renzini, A. ; Minniti, D. ; Pasquini, L. ; Bica, E. ; Rich, R. M. / VLT-UVES analysis of 5 giants in 47 Tucanae. En: Astronomy and Astrophysics. 2005 ; Vol. 435, N.º 2. pp. 657-667.
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title = "VLT-UVES analysis of 5 giants in 47 Tucanae",
abstract = "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 8 m VLT UT2-Kueyen telescope. The atmospheric parameters (Teff, log g, [Fe/H], vt) were derived from VIJK photometry and spectroscopic data based on FeI and FeII lines. FeI and FeII 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 v rhel = -22.43 ± 1.99 kms-1.",
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author = "A. Alves-Brito and B. Barbuy and S. Ortolani and Y. Momany and V. Hill and M. Zoccali and A. Renzini and D. Minniti and L. Pasquini and E. Bica and Rich, {R. M.}",
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Alves-Brito, A, Barbuy, B, Ortolani, S, Momany, Y, Hill, V, Zoccali, M, Renzini, A, Minniti, D, Pasquini, L, Bica, E & Rich, RM 2005, 'VLT-UVES analysis of 5 giants in 47 Tucanae', Astronomy and Astrophysics, vol. 435, n.º 2, pp. 657-667. https://doi.org/10.1051/0004-6361:20041634

VLT-UVES analysis of 5 giants in 47 Tucanae. / Alves-Brito, A.; Barbuy, B.; Ortolani, S.; Momany, Y.; Hill, V.; Zoccali, M.; Renzini, A.; Minniti, D.; Pasquini, L.; Bica, E.; Rich, R. M.

En: Astronomy and Astrophysics, Vol. 435, N.º 2, 05.2005, p. 657-667.

Resultado de la investigación: Article

TY - JOUR

T1 - VLT-UVES analysis of 5 giants in 47 Tucanae

AU - Alves-Brito, A.

AU - Barbuy, B.

AU - Ortolani, S.

AU - Momany, Y.

AU - Hill, V.

AU - Zoccali, M.

AU - Renzini, A.

AU - Minniti, D.

AU - Pasquini, L.

AU - Bica, E.

AU - Rich, R. M.

PY - 2005/5

Y1 - 2005/5

N2 - 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 8 m VLT UT2-Kueyen telescope. The atmospheric parameters (Teff, log g, [Fe/H], vt) were derived from VIJK photometry and spectroscopic data based on FeI and FeII lines. FeI and FeII 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 v rhel = -22.43 ± 1.99 kms-1.

AB - 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 8 m VLT UT2-Kueyen telescope. The atmospheric parameters (Teff, log g, [Fe/H], vt) were derived from VIJK photometry and spectroscopic data based on FeI and FeII lines. FeI and FeII 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 v rhel = -22.43 ± 1.99 kms-1.

KW - Globular clusters: general

KW - Globular clusters: individual: 47 Tucanae

KW - Stars: abundances

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U2 - 10.1051/0004-6361:20041634

DO - 10.1051/0004-6361:20041634

M3 - Article

AN - SCOPUS:20844457450

VL - 435

SP - 657

EP - 667

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

IS - 2

ER -

Alves-Brito A, Barbuy B, Ortolani S, Momany Y, Hill V, Zoccali M y otros. VLT-UVES analysis of 5 giants in 47 Tucanae. Astronomy and Astrophysics. 2005 may;435(2):657-667. https://doi.org/10.1051/0004-6361:20041634