Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Nuclear Astrophysics III
HK 34.4: Talk
Wednesday, February 28, 2018, 15:00–15:15, HZO 100
Electron capture processes in stellar degenerate cores — •Dag Fahlin Strömberg1,2, Heiko Möller1,2, and Gabriel Martinez-Pinedo1,2 — 1Institut für Kernphysik (Theoriezentrum), Technische Universität Darmstadt, Schlossgartenstraße 2, 64289 Darmstadt, Germany — 2Gesellschaft für Schwerionenforschung Darmstadt, Planckstr. 1, D-64259 Darmstadt, Germany
Electron capture reactions play an important role in the evolution of degenerate stellar cores. These reactions do not only reduce the degeneracy pressure by removing electrons, but can also heat and cool the core through double electron capture and Urca processes.
In this talk we will focus on accreting ONe white dwarfs and their evolution until the ignition of oxygen. Following carbon burning, the composition of such cores is 16O, 20Ne, 23Na, 24Mg and 25Mg. In addition, there can also be other nuclear species in the core due to a non-zero metallicity of the progenitor. We will discuss the effects of the above mentioned weak processes on the temporal evolution of the stellar core. In particular, we will focus on metallicity dependent effects. To do this we need accurate weak interaction rates, which at these conditions can be computed from a small number of dominant transitions.
This work is supported by the Deutsche Forschungsgemeinschaft through contract SFB 1245.