Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..990..167k&link_type=abstract
FIRST STARS III: First Stars II Conference. AIP Conference Proceedings, Volume 990, pp. 167-168 (2008).
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3
Population Ii Stars, Abundances, Chemical Composition, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Convection, Turbulence, And Diffusion
Scientific paper
The recent discovery of systematic trends of elemental abundances with evolutionary stage in the globular cluster NGC 6397 [1] has given support to the theoretical expectation that the abundances of elements in the atmospheres of unevolved halo stars are significantly affected by atomic diffusion. HE 1327-2326, one of the two known hyper-metal-poor (i.e., [Fe/H]<-5) stars, is in a near-turnoff stage of evolution [2, 3] and seemingly has no lithium (log ɛ(Li)<0.7, [4]). Based on various techniques we derive improved stellar parameters for this star. In particular, we derive a spectroscopic surface gravity based on the calcium ionization equilibrium in non-LTE [5]. HE 1327-2326 is found to be a subgiant. Calculations show that, while atomic diffusion may have significantly altered the surface abundances of this star, the large deficit of lithium (relative to other metal-poor stars and the amount produced in Big-Bang nucleosynthesis) cannot be explained in this way.
Aoki Wako
Christlieb Norbert
Frebel Anna
Korn Andreas J.
Mashonkina Lyudmila
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