منابع مشابه
Family ties : abundances in Terzan 7 , a Sgr dSph globular cluster ⋆
We study the chemical composition of 5 giant stars in the globular cluster Terzan 7 associated with the Sagittarius dwarf spheroidal galaxy (Sgr dSph), based on high resolution UVES-VLT spectra. We confirm the metallicity found by previous high resolution investigations: [Fe/H]∼ −0.6. We also show that this cluster displays the same low α−element to iron ratio found in Sgr dSph field stars of s...
متن کاملSulphur and iron abundances in halo stars
From equivalent widths of the S i lines at 8694 Å, Israelian & Rebolo (2001) and Takada-Hidai et al. (2002) have derived a surprisingly high sulphur-to-iron ratio ([S/Fe] ≃ 0.5 to 0.7) in six halo stars with [Fe/H] ≃ −2.0 suggesting perhaps that hypernovae made a significant contribution to the formation of elements in the early Galaxy. To investigate this problem we have used high-resolution s...
متن کاملSulphur abundances in metal - poor stars ⋆
We investigate the debated “sulphur discrepancy” found among metal-poor stars of the Galactic halo with [Fe/H]<−2. This discrepancy stems in part from the use of two different sets of sulphur lines, the very weak triplet at 8694 95 Å and the stronger triplet lines at 9212 9238 Å. For three representative cases of metal-poor dwarf, turnoff and subgiant stars, we argue that the abundances from th...
متن کاملHigh resolution infrared spectra of Bulge Globular Clusters : The extreme chemical abundances of Terzan 4 and Terzan 5
Using the NIRSPEC spectrograph at Keck II, we have obtained infrared echelle spectra covering the range 1.5− 1.8 μm for the highly reddened bulge globular clusters Terzan 4 and Terzan 5. The clusters are of interest because a blue horizontal branch in Terzan 4 is consistent with very low metallicity, while Terzan 5 has been proposed as possibly the most metal rich known Galactic globular cluste...
متن کاملSulphur abundances in halo stars from Multiplet 3 at 1045 nm
1 GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, Place Jules Janssen, 92190 Meudon, France 2 Max-Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741, Garching, Germany. 3 Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Königstuhl 12, 69117 Heidelberg, Germany 4 Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, Via Tiepolo 11...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:200500110