Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1756s&link_type=abstract
Astronomical Journal, vol. 84, Nov. 1979, p. 1756-1762.
Astronomy and Astrophysics
Astronomy
6
Abundance, Beryllium, Line Spectra, Nonequilibrium Thermodynamics, Satellite Observation, Solar Spectra, Atomic Energy Levels, Atomic Spectra, Electron Transitions, Oao 3, Spaceborne Astronomy
Scientific paper
The formation of beryllium lines, with particular reference to the solar Be spectrum, is investigated in a non-LTE context with a 25-level model atom in which 15 levels are allowed to depart from LTE. In some transitions, particularly the Be I 2650-A line, the non-LTE effects can be quite dramatic, changing the deduced abundances by a factor of 4. Based on the non-LTE calculations and Copernicus observations of other stars, it is found that a solar spectral feature at 2650 A, previously identified by numerous investigators as a Be I line, cannot be produced by Be I. Non-LTE effects on the Be II 3131-A line, used for most Be abundance determinations in the literature, are small by comparison.
Auer Lawrence H.
Shipman Harry L.
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