Abstract
An internacional project Lithium in magnetic Ap stars has been run since 1996 with the purpose of creating an observational database allowing systematic studies of the ab- normal occurence of lithium on the surface of cool Ap stars. The 2.6 m telescope at the Crimean Astrophysical Observatory, the ESO CAT, ESO 1.52 m telescope with FEROS, the Nordic Op- tical Telescope, and the 74 telescope at Mount Stromlo were employed to collect observations at the regions of the lithium resonance lines λ 6103 and λ 6708 ˚ Observations of the roAp-stars HD 83368, HD 60435 and HD 3980 revealed considerable peri- odical Doppler shifts of the line of lithium λ 6708 ˚ which can be explained by the presence of lithium spots on their surfaces. Conjunction with structures of the magnetic field is apparent. A detailed study of the blend at λ 6708 ˚ in HD 101065 confirmed the anomalous overabun- dance of lithium amounting to 3.1 dex, as well as unusual isotopic ratio 6 Li/ 7 Li∼ 0.3.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
