4 papers · 1 filter
New high resolution synthetic stellar libraries for the Gaia Mission
R. Sordo, A. Vallenari, J. C. Bouret +12
High resolution synthetic stellar libraries are of fundamental importance for the preparation of the Gaia Mission. We present new sets of spectral stellar libraries covering two sp…
Atomic diffusion and mixing in old stars II. Observations of stars in the globular cluster NGC 6397 with VLT/FLAMES-GIRAFFE
K. Lind, A. J. Korn, P. S. Barklem +1
Evolutionary trends in the surface abundances of heavier elements have recently been identified in the globular cluster NGC 6397 ([Fe/H]=-2), indicating the operation of atomic dif…
Atomic Diffusion and Mixing in Old Stars I. VLT/FLAMES-UVES Observations of Stars in NGC 6397
A. J. Korn, F. Grundahl, O. Richard +5
We present a homogeneous photometric and spectroscopic analysis of 18 stars along the evolutionary sequence of the metal-poor globular cluster NGC 6397 ([Fe/H] = -2), from the main…
HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
John E. Norris, N. Christlieb, A. J. Korn +5
We report the discovery and high-resolution, high S/N, spectroscopic analysis of the ultra-metal-poor red giant HE 0557-4840, which is the third most heavy-element deficient star c…