Isotopic abundances of HG in mercury stars inferred from the HG II line at 3984 A

Details Isotopic abundances of HG in mercury stars inferred from the HG II line at 3984 A Isotopic abundances of HG in mercury stars inferred from the HG II line at 3984 A

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..131w&link_type=abstract

Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 1, p. 131-140.

Astronomy and Astrophysics

Astrophysics

77

A Stars, Abundance, Line Shape, Mercury Isotopes, Stellar Spectra, Astronomical Spectroscopy, Hyperfine Structure, Line Spectra, Spectrum Analysis, Star Distribution

Scientific paper

Wavelengths of the Hg II absorption feature at 3984 A in 30 Hg stars are distributed uniformly from the value for the terrestrial mix to a value that corresponds to nearly pure Hg-204. The wavelengths are correlated loosely with effective temperatures inferred from Q(UBV). Relative isotopic abundances derived from partially resolved profiles of the 3984-A line in iota CrB, chi Lup, and HR 4072 suggest that mass-dependent fractionation has occurred in all three stars. It is supposed that such fractionation occurs in all Hg stars, and a scheme whereby isotopic compositions can be inferred from a comparison of stellar wavelengths and equivalent widths with those calculated for a family of fractionated isotopic mixes. Theoretical profiles calculated for the derived isotopic composition agree well with high-resolution interferometric profiles obtained for three of the stars.

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