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Tracing the evolution of NGC6397 through the chemical composition of its stellar populations
K. Lind, C. Charbonnel, T. Decressin +3
With the aim to constrain multiple populations in the metal-poor globular cluster NGC6397, we analyse and discuss the chemical compositions of a large number of elements in 21 red…
Age and helium content of the open cluster NGC 6791 from multiple eclipsing binary members. I. Measurements, methods, and first results
K. Brogaard, H. Bruntt, F. Grundahl +4
Earlier measurements of the masses and radii of the detached eclipsing binary V20 in the open cluster NGC 6791 were accurate enough to demonstrate that there are significant differ…
OGLE-2009-BLG-092/MOA-2009-BLG-137: A Dramatic Repeating Event With the Second Perturbation Predicted by Real-Time Analysis
Y. -H. Ryu, C. Han, K. -H. Hwang +105
We report the result of the analysis of a dramatic repeating gravitational microlensing event OGLE-2009-BLG-092/MOA-2009-BLG-137, for which the light curve is characterized by two…
The case of the disappearing CN-strong AGB stars in Galactic globular clusters -- Preliminary Results
S. W. Campbell, D. Yong, E. C. Wylie-de Boer +5
A previously reported literature search suggested that the AGB stars in Galactic globular clusters may be showing different distributions of CN-strong and CN-weak stars as compared…
A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies
T. R. Bedding, H. Kjeldsen, T. L. Campante +47
We have analyzed data from a multi-site campaign to observe oscillations in the F5 star Procyon. The data consist of high-precision velocities that we obtained over more than three…
Observational signatures of lithium depletion in the metal-poor globular cluster NGC6397
K. Lind, F. Primas, C. Charbonnel +2
The "stellar" solution to the cosmological lithium problem proposes that surface depletion of lithium in low-mass, metal-poor stars can reconcile the lower abundances found for Gal…