Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-04-21
Astron.Astrophys. 405 (2003) 753-762
Astronomy and Astrophysics
Astrophysics
11 pages, 10 figures, Accepted to the Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20030591
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 proposed by Reddy et al. (2002). Our spectrum synthesis suggests that the unidentified absorption is most probably produced by a high excitation SiI line originally proposed by Muller et al. (1975). Reanalysis of the Lithium-6/Lithium-7 isotopic ratio in HD82943 was performed by taking the SiI line into account and using new VLT/UVES spectra of HD82943 with a signal-to-noise ratio close to 1000. We confirm the presence of Lithium-6 in the star's atmosphere while the updated value for the isotopic ratio is f(Lithium-6) = 0.05+-0.02.
Israelian Garik
Mayor Michel
Rebolo Rafael
Santos Nuno
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