• J. Rosato

      Articles written in Journal of Astrophysics and Astronomy

    • Modeling of Stark–Zeeman Lines in Magnetized Hydrogen Plasmas

      J. Rosato H. Bufferand H. Capes M. Koubiti L. Godbert-Mouret Y. Marandet R. Stamm

      More Details Abstract Fulltext PDF

      The action of electric and magnetic fields on atomic species results in a perturbation of the energy level structure, which alters the shape of spectral lines. In this work, we present the Zeeman–Stark line shape simulation method and perform new calculations of hydrogen Lyman and Balmer lines, in the framework of magnetic fusion research. The role of the Zeeman effect, fine structure and the plasma's non-homogeneity along the line-of-sight are investigated. Under specific conditions, our results are applicable to DA white dwarf atmospheres.

    • Radiative Transfer Reconsidered as a Quantum Kinetic Theory Problem

      J. Rosato

      More Details Abstract Fulltext PDF

      We revisit the radiative transfer theory from first principles approach, inspired from quantum kinetic theory. The radiation field is described within the second quantization formalism. A master equation for the radiation density operator is derived and transformed into a balance relation in the phase space, which involves nonlocal terms owing to radiation coherence. In a perturbative framework, we focus on the lowest order term in $\hbar$-expansion and show that the radiation coherence results in an alteration of the photon group velocity. An application to the formation of hydrogen lines in stellar atmospheres is performed as an illustration.

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      Posted on January 27, 2016

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