A reappraisal of the solar photospheric C/O ratio

Carlos Allende Prieto; David L. Lambert; Martin Asplund

doi:10.1086/342095

A reappraisal of the solar photospheric C/O ratio

Carlos Allende Prieto^*, David L. Lambert, Martin Asplund

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

303 Citations (Scopus)

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 ε(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.

Original language	English
Pages (from-to)	L137-L140
Journal	Astrophysical Journal
Volume	573
Issue number	2 II
DOIs	https://doi.org/10.1086/342095
Publication status	Published - 10 Jul 2002

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title = "A reappraisal of the solar photospheric C/O ratio",

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 {\AA} 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 ε(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 = "Convection, Line: formation, Sun: abundances, Sun: photosphere",

author = "{Allende Prieto}, Carlos and Lambert, {David L.} and Martin Asplund",

year = "2002",

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doi = "10.1086/342095",

language = "English",

volume = "573",

pages = "L137--L140",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - A reappraisal of the solar photospheric C/O ratio

AU - Allende Prieto, Carlos

AU - Lambert, David L.

AU - Asplund, Martin

PY - 2002/7/10

Y1 - 2002/7/10

N2 - 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 ε(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.

AB - 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 ε(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.

KW - Convection

KW - Line: formation

KW - Sun: abundances

KW - Sun: photosphere

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U2 - 10.1086/342095

DO - 10.1086/342095

M3 - Article

SN - 0004-637X

VL - 573

SP - L137-L140

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

A reappraisal of the solar photospheric C/O ratio

Abstract

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