[en] We compare the helioseismic properties of two solar models, one calibrated with the OPAL opacities and the other with the recent Los Alamos LEDCOP (Light Element Detailed Configuration Opacity) 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 0.3% 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 both the OPAL and LEDCOP opacities produce solar models in close agreement with helioseismic inferences, but discrepancies still persist at the level of 0.6% between the calculated and inferred sound speed in the radiative interior of the Sun.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Neuforge-Verheecke, C.; Applied Physics Division, Los Alamos National Laboratory, X-2, MS B220, Los Alamos, NM 87545. ; Present address: Institute of Astrophysics and Geophysics, University of Liège, 5 avenue de Cointe, 4000 Liège, Belgium.
Guzik, J. A.; Applied Physics Division, Los Alamos National Laboratory, X-2, MS B220, Los Alamos, NM 87545.
Keady, J. J.; Theoretical Division, Los Alamos National Laboratory, T-4, MS B212, Los Alamos, NM 87545.
Magee, N. H.; Theoretical Division, Los Alamos National Laboratory, T-4, MS B212, Los Alamos, NM 87545.
Bradley, P. A.; Applied Physics Division, Los Alamos National Laboratory, X-2, MS B220, Los Alamos, NM 87545.
Noels-Grötsch, Arlette ; Institute of Astrophysics and Geophysics, University of Liège, 5 avenue de Cointe, 4000 Liège, Belgium.
Language :
English
Title :
Helioseismic Tests of the New Los Alamos LEDCOP Opacities
Publication date :
2001
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
