Analysis of the hyperfine and isotopic structure of Ga bt II in the optical spectrum of kappa Cnc and HR 7775

Details Analysis of the hyperfine and isotopic structure of Ga bt II in the optical spectrum of kappa Cnc and HR 7775 Analysis of the hyperfine and isotopic structure of Ga bt II in the optical spectrum of kappa Cnc and HR 7775

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...363..815n&link_type=abstract

Astronomy and Astrophysics, v.363, p.815-820 (2000)

Astronomy and Astrophysics

Astrophysics

9

Atomic Processes, Line: Profiles, Stars: Abundances, Stars: Chemically Peculiar, Stars: Individual: Kappa Cnc, Hr 7775

Scientific paper

Spectra of the HgMn stars kappa Cnc and HR 7775 have been analyzed, under the assumption of local thermodynamic equilibrium (LTE), with respect to the abundance and isotopic mixture of gallium. The primary purpose of the investigation was to level the contradictory results obtained using spectral lines in different spectral regions \cite{S96}. The analysis has been performed by Ga Ii lines in the optical region including hyperfine and isotopic components from new Fourier Transform Spectrometer measurements \cite{KL00}. Gallium has, for both stars, been determined to be overabundant by two orders of magnitude compared to the sun, using oscillator strengths derived by Ryabchikova & Smirnov \cite*{RS94}. The difference in abundance obtained using spectral lines in the UV and the visual spectral region is unexplainable by accounting for hyperfine and isotopic structure. Astrophysical log gf values have been determined for the Ga Ii 5p - 5d transitions at 5360, 5363 and 5421 Å.

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