Measurement of the Free-Free Absorption of Hydrogen at Stellar Interior Conditions
ORAL
Abstract
The transport of energy from the burning core to the surface is an essential component of any modeling of stellar bodies. Due to the extreme conditions inside stars, we rely, however, on untested simplistic theories to describe both major mechanisms of heat transport: conduction and radiation transport. In this contribution, we give the first experimental results for the optical properties of hydrogen, the main ingredient of stars, under conditions similar to those of red dwarf stars at ~1000x solid density and pressures of several gigabars. These extreme densities and temperature were created by indirect laser-compression on the National Ignition Facility. The transmission of several staggered X-ray pulses allows us to track the density evolution in the target and obtain the opacity of the hydrogen. The results show great deviations from often-used models.
*This work was supported by the Deutsche Forschungsgemeinschaft (DFG—German Research Foundation) Project No. 495324226. J.L. and D.K. acknowledge support by GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt as part of the R&D project SI-URDK2224 with the University of Rostock. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. The work of C. S. was performed under the auspices of the U.S. Department of Energy by Los Alamos National Laboratory under contract number 89233218NCA000001.
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Presenters
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Dominik Kraus
- University of Rostock