Sulphur abundances in halo stars from multiplet 3 at 1045 nm
نویسندگان
چکیده
منابع مشابه
Sulphur 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...
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 کاملNeutron-Capture Element Abundances in Halo Stars
Abundance comparisons of neutron-capture elements – those formed in slow (sprocess) and rapid (r-process) neutron-capture nucleosynthesis – are providing important new information about the nature of the earliest Galactic nucleosynthesis and the first stellar generations (see recent reviews by Truran et al. 2002, Sneden & Cowan 2003 and Cowan & Thielemann 2004). Most previous studies have been ...
متن کاملLithium Isotopic Abundances in Metal-poor Halo Stars
Very high-quality spectra of 24 metal-poor halo dwarfs and subgiants have been acquired with ESO’s VLT/UVES for the purpose of determining Li isotopic abundances. The derived 1D, nonLTE Li abundances from the Li i 670.8 nm line reveal a pronounced dependence on metallicity but with negligible scatter around this trend. Very good agreement is found between the abundances from the Li i 670.8 nm l...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 2010
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.201011353