Astrophysics
[Submitted on 6 Feb 2007 (v1), last revised 26 Mar 2007 (this version, v2)]
Title:The solar oxygen crisis: Probably not the last word
View PDFAbstract: In this work we present support for recent claims that advocate a downward revision of the solar oxygen abundance. Our analysis employs spatially-resolved spectro-polarimetric observations including the \FeI lines at 6302 Åand the \OI infrared triplet around 7774 Åin the quiet Sun. We used the \FeI lines to reconstruct the three-dimensional thermal and magnetic structure of the atmosphere. The simultaneous \OI observations were then employed to determine the abundance of oxygen at each pixel, using both LTE and non-LTE (NLTE) approaches to the radiative transfer. In this manner, we obtain values of \lgEO=8.63 (NLTE) and 8.93 (LTE) dex. We find an unsettling fluctuation of the oxygen abundance over the field of view. This is likely an artifact indicating that, even with this relatively refined strategy, important physical ingredients are still missing in the picture. By examining the spatial distribution of the abundance, we estimate realistic confidence limits of approximately 0.1 dex.
Submission history
From: Hector Socas-Navarro [view email][v1] Tue, 6 Feb 2007 16:56:51 UTC (120 KB)
[v2] Mon, 26 Mar 2007 16:50:09 UTC (138 KB)
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