The Interstellar Lithium Isotope Ratio Toward Per OB2
نویسندگان
چکیده
منابع مشابه
THE INTERSTELLAR RUBIDIUM ISOTOPE RATIO TOWARD r OPHIUCHI A
The isotope ratio Rb/Rb places constraints on models of the nucleosynthesis of heavy elements, but there is no precise determination of the ratio for material beyond the solar system. We report the first measurement of the interstellar Rb isotope ratio. Our measurement of the Rb i line at 7800 for the diffuse gas toward r Oph A yields Å a value of (1 j) that differs significantly from the meteo...
متن کاملThe Interstellar Rubidium Isotope Ratio toward Rho Ophiuchi A
The isotope ratio, Rb/Rb, places constraints on models of the nucleosynthesis of heavy elements, but there is no precise determination of the ratio for material beyond the Solar System. We report the first measurement of the interstellar Rb isotope ratio. Our measurement of the Rb I line at 7800 Å for the diffuse gas toward ρ Oph A yields a value of 1.21 ± 0.30 (1-σ) that differs significantly ...
متن کاملElectrochemical isotope effect and lithium isotope separation.
A large electrochemical isotopic effect is observed upon the electrodeposition of lithium from solutions of propylene carbonate producing isotopically light metal deposits. The magnitude of fractionation is controlled by the applied overpotential and is largest close to equilibrium. Calculated partition function ratios for tetrahedrally coordinated lithium complexes and metallic lithium predict...
متن کاملThe lithium isotope ratio in the metal-poor halo star G271-162 from VLT/UVES observations
A high resolution (λ/∆λ ' 110 000), very high S/N (>∼ 600) spectrum of the metal-poor turnoff star G 271162 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 Li i 670.8 nm line by means of spectral synthesis. The necessary stellar line broadening (...
متن کاملA low upper-limit on the lithium isotope ratio in HD140283
We have obtained a high-S/N (900–1100), high-resolving-power (R = 95 000) spectrum of the metal-poor subgiant HD 140283 in an effort to measure its 6Li/7Li isotope ratio. From a 1-D atmospheric analysis, we find a value consistent with zero, 6Li/7Li = 0.001, with an upper limit of 6Li/7Li < 0.018. This measurement supersedes an earlier detection (0.040 ± 0.015(1σ)) by one of the authors. HD 140...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2000
ISSN: 0074-1809
DOI: 10.1017/s0074180900166793