NASA NTRS · 19730029621
Thallium in the solar atmosphere.
Abstract
Evidence for the presence of thallium in the sun is presented. Umbral spectra were found to contain an absorption feature at or near the predicted position for the Tl I 5350 A line. Analysis of the 5350 A line indicated that the solar thallium abundance is given by log N(Tl) values ranging from 0.72 to 1.07 on the standard scale log N(H) = 12.00. Unidentified blends, however, limit the accuracy of the abundance determination.
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Lambert, D. L., Mallia, E. A., Smith, G.. 1972-09-01. Thallium in the solar atmosphere.. https://ntrs.nasa.gov/citations/19730029621
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