Abstract
On the basis of a series of low-noise, high-resolution photometric tracings of the Fraunhofer spectrum a search has been made in the sun for the ultimate lines of neutral rhenium. The records examined show no convincing evidence for the presence of solar Rei lines. For the rhenium content of the photosphere the present investigation gives an upper limit of approximately logN Re =-0.3, on the standard scale where logN H = 12.00.
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Swensson, J.W. A search for rhenium lines in the Fraunhofer spectrum. Sol Phys 13, 25–32 (1970). https://doi.org/10.1007/BF00963939
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DOI: https://doi.org/10.1007/BF00963939