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Part of the book series: GeoPlanet: Earth and Planetary Sciences ((GEPS))

Abstract

The chemical composition of the Sun is among the most important quantities in astrophysics. Solar abundances are needed for modelling stellar atmospheres, stellar structure and evolution, population synthesis, and galaxies as a whole. The solar abundance problem refers to the conflict of observed data from helioseismology and the predictions made by stellar interior models for the Sun, if these models use the newest solar chemical composition obtained with 3-D and NLTE models of radiative transfer. Here we take a close look at the problem from observational and theoretical perspective. We also provide a list of possible solutions, which have yet to be tested.

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Notes

  1. 1.

    Note, however, another very common definition of metallicity in stellar astrophysics, which is the relative abundance of iron in a star relative to the Sun, [Fe/H] \(=\) \(\log (n_\mathrm{Fe}/n_\mathrm{H})_\mathrm{star} - \log (n_\mathrm{Fe}/n_\mathrm{H})_\mathrm{Sun}\). Both definitions are used interchangeably, and there are transformation relations between \(Z\) and [Fe/H].

  2. 2.

    We follow the definition of refractory versus volatile elements used in planetary sciences (not in industry), as e.g. in Taylor (2001). In this definition, a material which has relatively high condensation temperature is refractory.

  3. 3.

    Note that the given \(\left( Z/X \right) \) were computed using photospheric abundances for the volatile elements and meteoritic abundances for all other elements. Therefore, it is slightly different from the present-day photospheric value, as e.g. given by (Asplund et al. (2009), Table 4), \(\left( Z/X \right) = 0.0181\).

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Acknowledgments

AMS is supported by the MICINN grant AYA2011-24704. This work was partly supported by the European Union FP7 programme through ERC grant number 320360. Figure 3 reproduced by permission of the AAS: Serenelli et al. (2011).

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Correspondence to Maria Bergemann .

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© 2014 Springer International Publishing Switzerland

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Bergemann, M., Serenelli, A. (2014). Solar Abundance Problem. In: Niemczura, E., Smalley, B., Pych, W. (eds) Determination of Atmospheric Parameters of B-, A-, F- and G-Type Stars. GeoPlanet: Earth and Planetary Sciences. Springer, Cham. https://doi.org/10.1007/978-3-319-06956-2_21

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