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- University of CopenhagenDK31 papers
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5 papers · 2 filters
Sound-speed inversion of the Sun using a nonlocal statistical convection theory
Chunguang Zhang, Licai Deng, Darun Xiong +1
Helioseismic inversions reveal a major discrepancy in sound speed between the Sun and the standard solar model just below the base of solar convection zone. We demonstrate that thi…
SN 2009kn - the twin of the Type IIn supernova 1994W
E. Kankare, M. Ergon, F. Bufano +17
We present an optical and near-infrared photometric and spectroscopic study of supernova (SN) 2009kn spanning ~1.5 yr from the discovery. The optical spectra are dominated by the n…
Abundances of neutron-capture elements in G 24-25. A halo-population CH subgiant
S. Liu, P. E. Nissen, W. J. Schuster +3
The differences between the neutron-capture element abundances of halo stars are important to our understanding of the nucleosynthesis of elements heavier than the iron group. We p…
Asteroseismology of the solar analogs 16 Cyg A & B from Kepler observations
T. S. Metcalfe, W. J. Chaplin, T. Appourchaux +34
The evolved solar-type stars 16 Cyg A & B have long been studied as solar analogs, yielding a glimpse into the future of our own Sun. The orbital period of the binary system is too…
HD 181068: A Red Giant in a Triply-Eclipsing Compact Hierarchical Triple System
A. Derekas, L. L. Kiss, T. Borkovits +41
Hierarchical triple systems comprise a close binary and a more distant component. They are important for testing theories of star formation and of stellar evolution in the presence…