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5 papers · 2 filters
Thermohaline Mixing and its Role in the Evolution of Carbon and Nitrogen Abundances in Globular Cluster Red Giants: The Test Case of Messier 3
George C. Angelou, Ross P. Church, Richard J. Stancliffe +2
We review the observational evidence for extra mixing in stars on the red giant branch (RGB) and discuss why thermohaline mixing is a strong candidate mechanism. We recall the simp…
Gravitational redshifts in main-sequence and giant stars
L. Pasquini, C. Melo, C. Chavero +4
Gravitational redshifts in solar-type main-sequence stars are expected to be some 500 ms greater than those in giants. Such a signature is searched for between groups of ope…
White-Dwarf Kicks and Implications for Barium Stars
Robert G. Izzard, Tyl Dermine, Ross P. Church
The formation mechanism of the barium stars is thought to be well understood. Barium-rich material, lost in a stellar wind from a thermally-pulsing asymptotic-giant branch star in…
Detection of high-velocity material from the wind-wind collision zone of Eta Carinae across the 2009.0 periastron passage
Jose H. Groh, Krister E. Nielsen, Augusto Damineli +15
We report near-IR spectroscopic observations of the Eta Carinae massive binary system during 2008-2009 using VLT/CRIRES. We detect a strong, broad absorption wing in He I 10833 ext…
The FERRUM project: laboratory-measured transition probabilities for Cr II
J. Gurell, H. Nilsson, L. Engstrom +4
Aims: We measure transition probabilities for Cr II transitions from the z ^4H_J, z ^2D_J, y ^4F_J, and y ^4G_J levels in the energy range 63000 to 68000 cm^{-1}. Methods: Radiativ…