A low upper-limit on the lithium isotope ratio in HD140283

Wako Aoki, Susumu Inoue, Satoshi Kawanomoto +4

We have obtained a high-S/N (900-1100), high-resolving-power (R=95000) spectrum of the metal-poor subgiant HD 140283 in an effort to measure its 6Li/7Li isotope ratio. From a 1-D a…