Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-18
Astronomy and Astrophysics
Astrophysics
5 pages with 6 figures. Accepted as a letter in A&A
Scientific paper
A high resolution (R = 110.000), very high S/N (>600) spectrum of the metal-poor turnoff star G271-162 has been obtained in connection with the commissioning of UVES at VLT/Kueyen. Using both 1D hydrostatic and 3D hydrodynamical model atmospheres, the lithium isotope ratio has been estimated from the LiI 670.8 nm line by means of spectral synthesis. The necessary stellar line broadening (1D: macroturbulence + rotation, 3D: rotation) has been determined from unblended KI, CaI and FeI lines. The 3D line profiles agree very well with the observed profiles, including the characteristic line asymmetries. Both the 1D and 3D analyses reveal a possible detection of 6Li in G271-162, 6Li/7Li = 0.02 +-0.01 (one sigma). It is discussed if the smaller amount of 6Li in G271-162 than in the similar halo star HD84937 could be due to differences in stellar mass and/or metallicity or whether it may reflect an intrinsic scatter of the Li isotope ratio in the ISM at a given metallicity.
Asplund Martin
D'Odorico Sandro
Hill Vanessa
Nissen Poul Erik
No associations
LandOfFree
The lithium isotope ratio in the metal-poor halo star G271-162 from VLT/UVES observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The lithium isotope ratio in the metal-poor halo star G271-162 from VLT/UVES observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The lithium isotope ratio in the metal-poor halo star G271-162 from VLT/UVES observations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-6563