منابع مشابه
The solar chemical composition
We review our current knowledge of the solar chemical composition as determined from photospheric absorption lines. In particular we describe the recent significant revisions of the solar abundances as a result of the application of a time-dependent, 3D hydrodynamical model of the solar atmosphere instead of 1D hydrostatic models. This has decreased the metal content in the solar convection zon...
متن کاملSolar Models with Non–standard Chemical Composition
The OPAL monochromatic opacity tables are used to evaluate the impact of a non-standard chemical composition on solar models. A calibrated olar model with consistent diffusion including the effect of radiative forces and ionization on drift velocities is presented. It is shown that surface abundances are predicted to change slightly more than in the standard solar models. All elements included ...
متن کاملComposition of the Solar Wind
Introduction: The solar wind reflects the composition of the Sun and physical processes in the corona. Analysis produces information on how the solar system was formed and on physical processes in the co-rona. The analysis can also produce information on the local interstellar medium, galactic evolution, comets in the solar wind, dust in the heliosphere, and matter escaping from planets. Histor...
متن کاملA Cosmic Abundance Standard: Chemical Homogeneity of the Solar Neighbourhood and the Ism Dust-phase Composition
A representative sample of unevolved early B-type stars in nearby OB associations and the field is analysed to unprecedented precision using NLTE techniques. The resulting chemical composition is found to be more metal-rich and much more homogeneous than indicated by previous work. A rms scatter of ∼10% in abundances is found for the six stars (and confirmed by six evolved stars), the same as r...
متن کاملSeismic study of the chemical composition of the solar convection zone
Recent downward revision of solar heavy-element abundances using threedimensional atmospheric model has introduced serious discrepancies between standard solar models and helioseismic inferences about solar structure. In this paper, we investigate the possibility of determining the heavy-element abundances using helioseismic inversion techniques with the hope of providing an independent estimat...
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ژورنال
عنوان ژورنال: Space Science Reviews
سال: 2007
ISSN: 0038-6308,1572-9672
DOI: 10.1007/s11214-007-9173-7