New measurement of the 6Li/7Li isotopic ratio in the extra-solar planet host star HD 82943 and line blending in the Li 6708 A region

The presence of possible blends in the spectral region of the Li resonance line at 6708 A in solar-type metal-rich stars is investigated using high resolution and high signal-to-noise spectroscopic observations. Our analysis does not confirm the identification of a weak absorption feature at 6708.025 A with the low excitation TiI line originally proposed by Müller et al. (1975). Reanalysis of the 6Li/ 7Li isotopic ratio in HD 82943 was performed by taking the S iI line into account and using new VLT/UVES spectra of HD 82943 with a signal-to-noise ratio close to 1000. We confirm the presence of 6Li in the starʹs atmosphere while the updated value for the isotopic ratio is ....