|Author||Aller, L. H. ♦ Bidelman, W. P.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PHYSICS ♦ ASTROPHYSICS ♦ CALCIUM ♦ CHROMIUM ♦ ELECTRONS ♦ ELEMENTS ♦ GALLIUM ♦ HIGH TEMPERATURE ♦ MANGANESE ♦ MEASURED VALUES ♦ QUANTITY RATIO ♦ REFLECTION ♦ SPECTROMETERS ♦ SPECTROSCOPY ♦ STARS ♦ STRONTIUM ♦ YTTRIUM ♦ ZIRCONIUM|
|Abstract||The chemical composition of the atmosphere of the manganese star 53 Tauri was studied with the aid of data secured with the coude spectrograph of a 120-inch reflector. Transition probabilities required for the problem were obtained from laboratory sources whenever possible, but some were obtained by the calibration of stellar data. The temperature of the star, deduced from ionization equilibria, is near 11,000 deg K approximates -a value in good agreement with that found from spectral energy scans by Sargent and Jugaku. The electron pressure in the atmosphere, deduced from the total intensities of the hydrogen lines, appears to lie in the neighborhood of 500 dynes cm/sup -2/. Several striking abundance anomalies are found; they cannot be explained by deviations from local thermodynamic equilibrium. Manganese seems to be the most abundant metal in the star, but gallium appears to show the greatest enhancement of abundance over the normal value. Strontium, yttrium, and zirconium are also enhanced in abundance, while chromium and calcium seem to be depleted. (auth)|
|Learning Resource Type||Article|
|Publisher Department||Univ. of California, Los Angeles|
|Organization||Univ. of California, Los Angeles|
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