Abstract
The Rb i resonance lines at 7800 and 7947 Å in the photospheric spectrum of the Sun have profiles which are influenced by the isotopic composition of rubidium. High resolution spectra obtained with the McMath Solar Telescope at Kitt Peak National Observatory have been studied. A solar isotopic composition Rb87/Rb = 0.27±0.04 was found using spectra of the Rb i line at 7800 Å obtained with the spectrograph slit in positions close to the solar limb. The other Rb i line was abandoned since it was seriously blended with a water vapour line and some additional faint unknown lines.
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Hauge, Ö. Isotopes of rubidium in the Sun. Sol Phys 26, 263–275 (1972). https://doi.org/10.1007/BF00165267
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DOI: https://doi.org/10.1007/BF00165267