Abstract
view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Solar Lithium Abundance. Peach, J. V. Abstract A photoelectric scanning technique has been used to record the Fraunhofer spectrum in the region of the lithium resonance lines with a resolving power of 500 000 and an rms noise level of less than 0.02% of the continuous intensity. As there is no direct evidence of the presence of the lithium lines, the spectra can be used only to set an upper limit to the abundance. Computations of possible wavelength shifts in the lines due to interactions with neutral hydrogen atoms, due to the Stark effect of electrons and to the relativistic gravitational effect, indicate that the lines should not be shifted from their laboratory wavelengths by more than the errors of the wavelength scale in the spectra. Using this result and assuming a kinetic temperature of 53000K and a microturbulent velocity of 1.4 km/sec for the layers of line formation, it is possible to set an upper limit of 0.61 mA to the lithium absorption which corresponds to an abundance log (NLi/NH) =0.38 on the scale of logN~ =12.00. This value, although considerably lower than the previously published estimates of Greenstein and Richardson (Astrophys. J. 113, 536,1951) and Lynds (Astrophys. J. 142, 396,1965), is consistent with the observed enhancement of the lines in spot spectra assuming the spot model atmosphere of Zwaan (Rech. Astron. Obs. Utrecht 17, Part 4,1965). Publication: The Astronomical Journal Pub Date: September 1967 DOI: 10.1086/110555 Bibcode: 1967AJ.....72S.822P full text sources ADS |
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