Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-06
Astronomy and Astrophysics
Astrophysics
5 pages, 2*5 figs, submitted for IAUS #224 Proceedings
Scientific paper
10.1017/S1743921305009622
The lines of lithium at 6708 A, and 6103 A, 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 the rare earth elements from the DREAM database, and lines calculated on the basis of the NIST energy levels were included. Magnetic splitting and other line broadening processes were taken into account. Enhanced abundances of lithium in the atmospheres of the stars studied are obtained for both the lithium lines. High estimates of 6Li/7Li ratio (0.2 -- 0.5) for the studied star can be explained by Galactic Cosmic Ray (GCR) production through the spallation reactions and the preservation of the original $^6$Li and $^7$Li by the strong magnetic fields.
Gopka Vera
Hatzes Artie
Khalack V.
Khan Sergiy
Mikhailitska N.
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