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New Abundances for Old Stars - Atomic Diffusion at Work in NGC 6397
A. J. Korn, F. Grundahl, O. Richard +5
A homogeneous spectroscopic analysis of unevolved and evolved stars in the metal-poor globular cluster NGC 6397 with FLAMES-UVES reveals systematic trends of stellar surface abunda…
Pinning Down Gravitational Settling
Andreas J. Korn, Nikolai Piskunov, Frank Grundahl +2
We analyse high-resolution archival UVES data of turnoff and subgiant stars in the nearby globular cluster NGC 6397 ([Fe/H] = -2). Balmer-profile analyses are performed to derive r…
A probable stellar solution to the cosmological lithium discrepancy
A. J. Korn, F. Grundahl, O. Richard +5
The measurement of the cosmic microwave background has strongly constrained the cosmological parameters of the Universe. When the measured density of baryons (ordinary matter) is c…
The peculiar sdB NGC6121-V46: A low-mass double degenerate ellipsoidal variable in a globular cluster
S. J. O'Toole, R. Napiwotzki, U. Heber +4
The variable sdB known as V46 in the globular cluster M4 has remained enigmatic since its discovery almost 10 years ago. We present here radial velocity measurements obtained from…
Solar-like oscillations in the metal-poor subgiant nu Indi: constraining the mass and age using asteroseismology
Timothy R. Bedding, R. Paul Butler, Fabien Carrier +9
Asteroseismology is a powerful method for determining fundamental properties of stars. We report the first application to a metal-poor object, namely the subgiant star nu Ind. We m…