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18 papers · 2 filters
An evidence-based assumption that helps to reduce the discrepancy between the observed and predicted Be abundances in novae
Pavel A. Denissenkov, Chris Ruiz, Sriteja Upadhyayula +1
Recent spectroscopic measurements of the equivalent widths of the resonant Be II doublet and Ca II K lines and their ratios in expanding nova ejecta indicate surprisingly high abun…
Metal-Poor Stars Observed with the Southern African Large Telescope
Kaitlin C. Rasmussen, Joseph Zepeda, Timothy C. Beers +5
We present the first release of a large-scale study of relatively bright (V < 13.5) metal-poor stars observed with the Southern African Large Telescope (SALT), based on high-resolu…
The impact of (n,) reaction rate uncertainties of unstable isotopes on the i-process nucleosynthesis of the elements from Ba to W
Pavel A. Denissenkov, Falk Herwig, Georgios Perdikakis +1
The abundances of n-capture elements in the CEMP-r/s stars agree with predictions of intermediate n-density nucleosynthesis, at -$10^{15} \mathrm{cm}^{-3}…
Detection of Pb II in the Ultraviolet Spectra of Three Metal-Poor Stars
Ian U. Roederer, James E. Lawler, Erika M. Holmbeck +8
We report the first detection of the Pb II line at 2203.534 Angstroms in three metal-poor stars, using ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph on…
On The Development of Multidimensional Progenitor Models For Core-collapse Supernovae
C. E. Fields, S. M. Couch
Multidimensional hydrodynamic simulations of shell convection in massive stars suggest the development of aspherical perturbations that may be amplified during iron core-collapse.…
Heavy Elements Nucleosynthesis On Accreting White Dwarfs: building seeds for the p-process
Umberto Battino, Marco Pignatari, Claudia Travaglio +5
The origin of the proton-rich trans-iron isotopes in the solar system is still uncertain. Single-degenerate thermonuclear supernovae (SNIa) with n-capture nucleosynthesis seeds ass…