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Sound speed and oscillation frequencies for solar models evolved with Los Alamos ATOMIC opacities

Published online by Cambridge University Press:  27 October 2016

Joyce A. Guzik ,
C. J. Fontes ,
P. Walczak ,
S. R. Wood ,
K. Mussack  and
E. Farag
Joyce A. Guzik
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM USA 87545 email: [email protected]
C. J. Fontes
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM USA 87545 email: [email protected]
P. Walczak
Affiliation:
Instytut Astronomiczny, Uniwersytet Wrocławski, Wrocław, Poland
S. R. Wood
Affiliation:
University of Oregon, Eugene, OR USA 97403
K. Mussack
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM USA 87545 email: [email protected]
E. Farag
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM USA 87545 email: [email protected] Ohio State U., Columbus, OH 43210USA
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Abstract

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Los Alamos National Laboratory has calculated a new generation of radiative opacities (OPLIB data using the ATOMIC code) for elements with atomic number Z = 1-30 with improved physics input, updated atomic data, and finer temperature grid to replace the Los Alamos LEDCOP opacities released in the year 2000. We calculate the evolution of standard solar models including these new opacities, and compare with models evolved using the Lawrence Livermore National Laboratory OPAL opacities (Iglesias & Rogers 1996). We use the solar abundance mixture of Asplund et al. 2009. The Los Alamos ATOMIC opacities (Colgan et al. 2013a, 2013b, 2015) have steeper opacity derivatives than those of OPAL for temperatures and densities of the solar interior radiative zone. We compare the calculated nonadiabatic solar oscillation frequencies and solar interior sound speed to observed frequencies and helioseismic inferences. The calculated sound-speed profiles are similar for models evolved using either the updated Iben evolution code (see Guzik & Mussack 2010), or the MESA evolution code (Paxton et al. 2015). The LANL ATOMIC opacities partially mitigate the ‘solar abundance problem’.

Keywords

atomic data: opacitiesSun: interiorSun: evolutionSun: oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 532 - 535
Copyright
Copyright © International Astronomical Union 2016 

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