Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..237m&link_type=abstract
Astrophysical Journal, Part 1, vol. 239, July 1, 1980, p. 237-247.
Astronomy and Astrophysics
Astrophysics
7
A Stars, Mercury (Metal), Metallic Stars, Stellar Atmospheres, Stellar Models, Abundance, Manganese, Stellar Spectra
Scientific paper
Lines of the first three states of ionization of mercury have been observed in Mu Leporis and Chi Lupi using the Copernicus satellite. Lines of Hg II and Hg III have been observed in Alpha Andromedae. There appears to be an absorption feature at every wavelength where there is expected to be a mercury line. The presence of all three states of ionization is likely in Mu Lep and Chi Lup. The relative equivalent widths of the lines of the various states of ionization do not depend on the effective temperature of the stars, in contradiction to what is expected if mercury were uniformly distributed in the atmosphere. It is, however, expected if mercury has been concentrated, by diffusion, in a thin layer, where the radiative forces just equal the gravitational forces on mercury. That mercury should be so concentrated is also required by the explanation of the mercury isotope anomaly proposed by Michaud, Reeves, and Charland.
Megessier C.
Michaud Georges
Weiler Edward J.
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