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One- and multi-component models of the upper photosphere based on molecular spectra

IV: Non-LTE treatment of the CN violet system

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Abstract

Non-LTE synthetic spectra derived from a detailed analysis of the formation of the CN (0, 0) λ13883 Å spectrum are compared with center-limb photoelectric spectra taken at Kitt Peak National Observatory.Footnote 1 Significant non-LTE effects are found and the Kurucz, Altrock-Cannon, Mount-Linsky II, and HSRA models are compared. We derive a solar carbon abundance of A c =8.30±0.10 for the Mount-Linsky model and A c =8.40±0.10 for the Altrock-Cannon model, compared to the HSRA value of A c =8.55±0.10, assuming a nitrogen abundance of logA N=7.93. In addition we specify the regions of formation for the CN(0, 0) 3883.35 Å bandhead at disc center and limb.

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Notes

  1. Kitt Peak National Observatory is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation.

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Authors and Affiliations

  1. Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards, 80302, Boulder, Colo., U.S.A.

    George H. Mount & Jeffrey L. Linsky

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  1. George H. Mount
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  2. Jeffrey L. Linsky
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Staff member, Laboratory Astrophysics Division, National Bureau of Standards.

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Mount, G.H., Linsky, J.L. One- and multi-component models of the upper photosphere based on molecular spectra. Sol Phys 41, 17–33 (1975). https://doi.org/10.1007/BF00152952

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