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The chemical compositions and surface structures of two roAp stars with lithium spots (HD 83368 and HD 60435)

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Abstract

The spectra of two roAp stars have been analyzed as part of a project to study lithium in magnetic Ap stars. Variability of the Li I 6708 Å resonance doublet and rare-earth lines was detected, which can be explained using an oblique rotator model with the lithium spots located at the magnetic poles. Synthetic spectra obtained at different rotational phases have yielded the first data on the atmospheric chemical compositions of these spotted stars. Using refined atomic data and the most complete line lists has enabled a detailed study of the spectra near the Li I 6708 Å line and computation of the Li I line profile taking into account the spotted distribution of the lithium over the stellar surfaces. The positions of two lithium spots and lithium abundances for each of the spots have been determined.

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Authors and Affiliations

  1. Crimean Astrophysical Observatory, p/o Nauchnyi, Crimea, 334413, Ukraine

    A. V. Shavrina & N. S. Polosukhina

  2. Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, 05960, Slovak Republik

    J. Zverko & J. Žižňovský

  3. Main Astronomical Observatory, National Academy of Sciences of Ukraine, Goloseevo, Kiev, 252127, Ukraine

    V. Khalak

  4. Tavrian State University, Simferopol, Crimea, Ukraine

    V. V. Tsymbal

Authors
  1. A. V. Shavrina
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  2. N. S. Polosukhina
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  3. J. Zverko
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  4. V. Khalak
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  5. V. V. Tsymbal
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  6. J. Žižňovský
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__________

Translated from Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Zhurnal, Vol. 78, No. 10, 2001, pp. 902–914.

Original Russian Text Copyright © 2001 by Shavrina, Polosukhina, Zverko, Khalak, Tsymbal, Žižňovský.

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Shavrina, A.V., Polosukhina, N.S., Zverko, J. et al. The chemical compositions and surface structures of two roAp stars with lithium spots (HD 83368 and HD 60435). Astron. Rep. 45, 784–796 (2001). https://doi.org/10.1134/1.1408979

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  • DOI: https://doi.org/10.1134/1.1408979

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