SOLAR OPACITY CALCULATIONS USING THE SUPER-TRANSITION-ARRAY METHOD

M. Krief, A. Feigel, D. Gazit

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

A new opacity model has been developed based on the Super-Transition-Array (STA) method for the calculation of monochromatic opacities of plasmas in local thermodynamic equilibrium. The atomic code, named STAR (STA-Revised), is described and used to calculate spectral opacities for a solar model implementing the recent AGSS09 composition. Calculations are carried out throughout the solar radiative zone. The relative contributions of different chemical elements and atomic processes to the total Rosseland mean opacity are analyzed in detail. Monochromatic opacities and charge-state distributions are compared with the widely used Opacity Project (OP) code, for several elements near the radiation-convection interface. STAR Rosseland opacities for the solar mixture show a very good agreement with OP and the OPAL opacity code throughout the radiation zone. Finally, an explicit STA calculation was performed of the full AGSS09 photospheric mixture, including all heavy metals. It was shown that, due to their extremely low abundance, and despite being very good photon absorbers, the heavy elements do not affect the Rosseland opacity.

Original languageAmerican English
Article number45
JournalAstrophysical Journal
Volume821
Issue number1
DOIs
StatePublished - 10 Apr 2016

Bibliographical note

Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.

Keywords

  • Sun: interior
  • atomic data
  • atomic processes
  • dense matter
  • opacity
  • plasmas

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