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20 papers · 2 filters
An empirical recipe for inelastic hydrogen-atom collisions in non-LTE calculations
Rana Ezzeddine, Thibault Merle, Bertrand Plez +3
We investigate the role of hydrogen collisions in NLTE spectral line synthesis, and introduce a new general empirical recipe to determine inelastic charge transfer (CT) and bound-b…
Ultra metal-poor stars: Spectroscopic determination of stellar atmospheric parameters using iron Non-LTE line abundances
Rana Ezzeddine, Anna Frebel, Bertrand Plez
We present new ultra-metal-poor (UMP) stars parameters with [Fe/H]<-4.0 based on line-by-line non-local thermodynamic equilibrium (NLTE) abundances using an up-to-date iron model a…
The impact of (n,) reaction rate uncertainties of unstable isotopes near on the i process nucleosynthesis in He-shell flash white dwarfs
Pavel Denissenkov, Georgios Perdikakis, Falk Herwig +6
The first peak s-process elements Rb, Sr, Y and Zr in the post-AGB star Sakurai's object (V4334 Sagittarii) have been proposed to be the result of i-process nucleosynthesis in a po…
Combined Nucleosynthetic Yields of Multiple First Stars
Conrad Chan, Alexander Heger
Modern numerical simulations of the formation of the first stars predict that the first stars formed in multiples. In those cases, the chemical yields of multiple supernova explosi…
Neutron-Capture Element Abundances in Magellanic Cloud Planetary Nebulae
A. L. Mashburn, N. C. Sterling, S. Madonna +3
We present near-infrared spectra of ten planetary nebulae (PNe) in the Large and Small Magellanic Clouds (LMC and SMC), acquired with the FIRE and GNIRS spectrometers on the 6.5-m…
i-process nucleosynthesis and mass retention efficiency in He-shell flash evolution of rapidly accreting white dwarfs
Pavel Denissenkov, Falk Herwig, Umberto Battino +4
Based on stellar evolution simulations, we demonstrate that rapidly accreting white dwarfs in close binary systems are an astrophysical site for the intermediate neutron-capture pr…