Determination of the uranium abundance in the AP star 73 DRA using the line U II 3859.58 A

Details Determination of the uranium abundance in the AP star 73 DRA using the line U II 3859.58 A Determination of the uranium abundance in the AP star 73 DRA using the line U II 3859.58 A

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986afz....25..237i&link_type=abstract

(Astrofizika, vol. 25, Sept.-Oct. 1986, p. 237-249) Astrophysics (ISSN 0571-7132), vol. 25, no. 2, March 1987, p. 491-498. Trans

Astronomy and Astrophysics

Astrophysics

2

A Stars, Abundance, Line Spectra, Stellar Atmospheres, Stellar Spectra, Uranium, Atmospheric Models, Chromosphere, Iron, Spectrograms, Temperature Distribution, Thermodynamics, Ultraviolet Spectra

Scientific paper

The uranium abundance in the atmosphere of the Ap star 73 Dra has been determined by the method of synthetic spectra using four spectrograms in the interval 3858.5-3860.5 A containing the line U II 3859.58 A. As a preliminary, the spectrum of Procyon was used to check the oscillator strengths of the lines in this interval; there was found to be a discrepancy between the theory and the observed central depth of the strong line Fe I 3859.91 A, which did not disappear even after the model of the atmosphere of Procyon had been augmented by a model of the chromosphere and allowance made for the enhanced ionization of the Fe I atoms due to deviation from local thermodynamic equilibrium. Analysis of the line U II 3859.58 A confirmed the high uranium abundance found for 73 Dra from an ultraviolet spectrum obtained at the Astron station. From the average over the four spectra, which corresponded to the phases phi = 0.375, 0.88, 0.19, and 0.77, the uranium abundance was found to be log epsilon(U) = 4.1, this exceeding by four orders of magnitude the value log epsilon(U) = 0.1-0.2 found from meteorites.

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