2003ApJ...586..268K

In an effort to probe the extent of variations in the interstellar ⁷Li/⁶Li ratio seen previously, ultra-high-resolution (R∼360,000), high signal-to-noise spectra of stars in the Perseus OB2 and Scorpius OB2 associations were obtained. These measurements confirm our earlier findings of an interstellar ⁷Li/⁶Li ratio of about 2 toward ο Per, the value predicted from models of Galactic cosmic-ray spallation reactions. Observations of other nearby stars yield limits consistent with the isotopic ratio of ∼12 seen in carbonaceous chondrite meteorites. If this ratio originally represented the gas toward ο Per, then to decrease the original isotope ratio to its current value an order of magnitude increase in the Li abundance is expected, but it is not seen. The elemental K/Li ratio is not unusual, although Li and K are formed via different nucleosynthetic pathways. Several proposals to account for the low ⁷Li/⁶Li ratio were considered, but none seems satisfactory. Analysis of the Li and K abundances from our survey highlighted two sight lines where depletion effects are prevalent. There is evidence for enhanced depletion toward X Per, since both abundances are lower by a factor of 4 when compared to other sight lines. Moreover, a smaller Li/H abundance is observed toward 20 Aql, but the K/H abundance is normal, suggesting enhanced Li depletion (relative to K) in this direction. Our results suggest that the ⁷Li/⁶Li ratio has not changed significantly during the last 4.5 billion years and that a ratio of ∼12 represents most gas in the solar neighborhood. In addition, there appears to be a constant stellar contribution of ⁷Li, indicating that one or two processes dominate its production in the Galaxy.