• N. Polosukhina
  • A. Shavrina
  • D. Lyashko
  • N. Nesvacil
  • N. Drake
  • M. Smirnova
The lines of lithium at 6708 Å and 6103 Å are analyzed in high resolution spectra of some sharp-lined and slowly rotating roAp stars. Three spectral synthesis codes— STARSP, ZEEMAN2, and SYNTHM—were used. New lines of rare earth elements (REE) from the DREAM database and the lines calculated on the basis of the NIST energy levels were included. Magnetic splitting and other line broadening processes were taken into account. For both lithium lines, the enhanced abundances of lithium in the atmospheres of the stars studied are obtained. The lithium abundance determined from the Li 6103 Å line is higher than that from the Li 6708 Å for all the stars. This may be evidence of vertical lithium stratification, abnormal temperature distribution, or unidentified blending of the 6103 Å line. Our work on two roAp stars, HD 83368 and HD 60435 (Shavrina et al. 2001) provides evidence of an enhanced lithium abundance near the magnetic-field poles. We can expect similar effects in the sharp-lined roAp stars. High lithium abu
Original languageEnglish
Pages (from-to)184-188
JournalPublications of the Astronomical Society of the Pacific
Volume494
StatePublished - 2015

    Research areas

  • stellar atmospheres, magnetic fields, chemical abundances, peculiar stars

ID: 5797408