Abstract
Recent spectroscopic data pointing to low heavy-element abundances Z pose a severe problem for solar-structure modeling. The low-Z abundances imply a lower opacity and a relatively shallow convective zone, both of which are in obvious contradiction with the observed helioseismic sound-speed profile. This paper presents a series of solar models with different heavy-element abundances. The SAHA-S equation of state and OPAL opacities properly take into account the respective heavy-element abundances. Diffusion of individual elements is also included in the models. Sound-speed profiles are compared with inversion results and it is shown that the models with low Z are in disagreement with the inversion data. Even combining the effect of diffusion, overshooting and mixing for the sound-speed profile did not lead to a solution of the low-Z problem. Models with varied neon abundance have also been computed. It turned out that a substantial increase of the neon abundance could produce a model in agreement with the sound-speed inversion but the required abundance increase would be unrealistic. The effect of the neon enhancement on the adiabatic exponent profile in the convection zone is also presented.
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References
Anders, E., Grevesse, N.: Geochim. Cosmochim. Acta 53, 197 (1989) (AG89)
Asplund, M., et al.: Astron. Astrophys. 417, 751 (2004)
Asplund, M., Grevesse, N., Sauval, A.J.: In: Barnes, T.G., Bash, F.N. (eds.) Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis. ASP Conference Series, vol. 336, p. 25. ASP, San Francisco (2005) (AGS05)
Asplund, M., Grevesse, N., Sauval, A.J., Scott, P.: Annu. Rev. Astron. Astrophys. 47(1), 481 (2009) (AGSS09)
Bahcall, J.N., Pinsonneault, M.H., Wasserburg, G.J.: Rev. Mod. Phys. 67(4), 781 (1995)
Bahcall, J.N., Basu, S., Serenelli, A.M.: Astrophys. J. 631, 1281 (2005)
Basu, S., Antia, H.M.: Phys. Rep. 457, 217 (2008)
Baturin, V., Mironova, I.: Astrophys. Space Sci. (2010). doi:10.1007/s10509-009-0263-8.
Christensen-Dalsgaard, J., et al.: Science 272, 1286 (1996)
Ferguson, J.W., et al.: Astrophys. J. 623, 585 (2005)
Grevesse, N., Noels, A.: In: Prantzos, N., Vangioni-Flam, E., Cass‘e, M. (eds.) Origin and Evolution of the Elements. Cambridge University Press, Cambridge (1993) (GN93)
Grevesse, N., Sauval, A.J.: Space Sci. Rev. 85, 161 (1998) (GS98)
Gryaznov, V.K., et al.: In: Celebonovic, V., Dappen, W., Gough, D. (eds.) Equation-of-State and Phase-Transition Issues in Models of Ordinary Astrophysical Matter. AIP Conference Proceedings, vol. 731, p. 147. AIP, New York (2004)
Iglesias, C.A., Rogers, F.J.: Astrophys. J. 464, 943 (1996)
Michaud, G., Proffitt, C.R.: In: Weiss, W.W., Baglin, A. (eds.) Inside the stars, IAU Colloquium 137. ASP Conference Series, vol. 40, p. 137. ASP, New York (1993)
Rogers, F.J., Iglesias, C.A.: Astrophys. J. Suppl. Ser. 79, 507 (1992)
Shaviv, G., Salpeter, E.E.: Astrophys. J. 184, 191 (1973)
Turcotte, S., et al.: Astrophys. J. 504, 539 (1998)
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Ayukov, S.V., Baturin, V.A. Low heavy-element photospheric abundance: a challenge for solar modeling. Astrophys Space Sci 328, 23–27 (2010). https://doi.org/10.1007/s10509-010-0298-x
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DOI: https://doi.org/10.1007/s10509-010-0298-x