Abstract

An accurate determination of photospheric solar abundances requires detailed modeling of the solar granulation and accounting for departures from local thermodynamical equilibrium (LTE). We argue that the forbidden C i line at 8727 A° is largely immune to departures from LTE and can be realistically modeled using LTE radiative transfer in a time-dependent three-dimensional simulation of solar surface convection. We analyze the [C i] line in the solar flux spectrum to derive the abundance log e(C) = 8.39 ± 0.04 dex. Combining this result with our parallel analysis of [O i] λ6300, we find C/O = 0.50 ± 0.07, in agreement with the ratios measured in the solar corona from gamma-ray spectroscopy and solar energetic particles.

Keywords

AstrophysicsPhysicsRadiative transferLine (geometry)Corona (planetary geology)Computational physicsConvectionSolar physicsSolar atmosphereConvection zoneThermodynamicsOpticsStarsAstrobiologyGeometry

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Year
2002
Type
article
Volume
573
Issue
2
Pages
L137-L140
Citations
426
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Closed

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Carlos Allende Prieto, David L. Lambert, M. Asplund (2002). A Reappraisal of the Solar Photospheric C/O Ratio. The Astrophysical Journal , 573 (2) , L137-L140. https://doi.org/10.1086/342095

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DOI
10.1086/342095