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

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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.

Original languageEnglish
Pages (from-to)657-667
Number of pages11
JournalAstronomy and Astrophysics
Volume435
Issue number2
DOIs
Publication statusPublished - May 2005

Keywords

  • Globular clusters: general
  • Globular clusters: individual: 47 Tucanae
  • Stars: abundances

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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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, 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