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On the abundance of chlorine in the Sun
Authors:D L Lambert  E A Mallia  J Brault
Institution:(1) Department of Astronomy, University of Texas at Austin, Austin, Texas, U.S.A;(2) Department of Astrophysics, University of Oxford, Oxford, England;(3) Kitt Peak National Observatory, Tucson, Ariz., U.S.A
Abstract:A low-noise photoelectric scan which includes the predicted position of the Cli transition 4s 4 P 5/2-4 p 4 D 0 7/2 provides inconclusive evidence for the presence of the line in the solar photospheric spectrum. An upper limit logN(Cl) les 5.5 is derived. It is pointed out that the fundamental vibration rotation band of HC1 at 3.3 mgr should be detectable in the sunspot spectrum unless logN(Cl) < 4.6. Sunspot spectra may also provide the isotopic abundance ratio N(Cl35)/N(Cl37).A new derivation of the chlorine abundance for the Orion nebula is presented: logN(Cl) ap 5.8. It is suggested that a cosmic abundance logN(Cl) = 5.5 to 5.8 be adopted.Operated by the Association of Universities for Research in Astronomy Inc., under contract with the National Science Foundation.
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