HELIOSEISMIC TESTS OF THE NEW LOS ALAMOS OPACITIES Page: 2 of 18
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Helioseismic tests of the new Los Alamos LEDCOP opacities
C. Neuforge-Verheecke'4, J.A. Guzik', J.J. Keady2, N.H. Magee2, P.A. Bradley1, A. Noels3
1Applied Physics Division, Los Alamos National Laboratory, X-2, MS B220, Los Alamos,
NM 8754 5, USA
2 Theoretical Division, Los Alamos National Laboratory, T-4, MS B212, Los Alamos, NM
87545, USA
3 Institute of Astrophysics and Geophysics, University of Liege, 5 avenue de Cointe, 4000
Liege, Belgium
ABSTRACT
We compare the helioseismic properties of two solar models, one calibrated
with the OPAL opacities and the other with the recent Los Alamos LEDCOP
opacities. We show that, in the radiative interior of the Sun, the small differences
between the two sets of opacities (up to 6% near the base of the convection zone)
lead to noticeable differences in the solar structure (up to 0.4% in sound speed),
with the OPAL model being the closest to the helioseismic data. More than half of
the difference between the two opacity sets results from the interpolation scheme
and from the relatively widely spaced temperature grids used in the tables. The
remaining 3% intrinsic difference between the OPAL and the LEDCOP opacities
in the radiative interior of the Sun is well within the error bars on the opacity
calculations resulting from the uncertainties on the physics. We conclude that
the OPAL and LEDCOP opacity sets do about as well in the radiative interior
of the Sun.
Subject headings: - Sun: interior - Sun: helioseismology
1. Introduction
Opacities are a key ingredient in stellar evolution and pulsation calculations. Recently,
a new set of Los Alamos opacities has been computed, using an updated version of the Los
4Present address: Institute of Astrophysics and Geophysics, University of Liege, 5 avenue de Cointe, 4000
Liege, Belgium
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GUZIK, J. & AL, ET. HELIOSEISMIC TESTS OF THE NEW LOS ALAMOS OPACITIES, article, January 1, 2001; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc725012/m1/2/: accessed March 29, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.