A Reappraisal of the Solar Photospheric C/O Ratio | Zendy

Carlos Allende Prieto | Zendy; David L. Lambert | Zendy; M. Asplund | Zendy

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A Reappraisal of the Solar Photospheric C/O Ratio

Author(s) -

Carlos Allende Prieto,

David L. Lambert,

M. Asplund

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/342095

Subject(s) - astrophysics , physics , radiative transfer , line (geometry) , corona (planetary geology) , computational physics , convection , solar physics , solar atmosphere , convection zone , thermodynamics , optics , stars , astrobiology , geometry , quantum mechanics , magnetic field , mathematics , venus

Accurate determination of photospheric solar abundances requires detailedmodeling of the solar granulation and accounting for departures from localthermodynamical equilibrium (LTE). We argue that the forbidden C I line at 8727A is largely immune to departures from LTE, and can be realistically modeledusing LTE radiative transfer in a time-dependent three-dimensional simulationof solar surface convection. We analyze the [C I] line in the solar fluxspectrum to derive the abundance log epsilon(C)= 8.39 +/- 0.04 dex. Combiningthis result with our parallel analysis of the [O I] 6300 A line, we findC/O=0.50 +/- 0.07, in agreement with the ratios measured in the solar coronafrom gamma-ray spectroscopy and solar energetic particles.Comment: 5 pages, 2 figures, to appear in ApJL July 1

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