A Reappraisal of the Solar Photospheric C/O Ratio
Top Cited Papers
- 10 July 2002
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 573 (2) , L137-L140
- https://doi.org/10.1086/342095
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 Å 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 (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
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