The Distribution of Li-Like Ions in the Local Bubble

Abstract

We study, by means of three-dimensional adaptive mesh refinement simulations, the spatial distribution of the Li-like ions C iv, N v, and O vi inside the Local Bubble (LB), powered by 19 missing stars of subgroup B1 of the Pleiades suggested as responsible for its origin. The ions C iv, N v, and O vi, and the distribution of their column density ratios (N(C iv)/N(O vi) and N(N v)/N(O vi)) in the simulations are monitored through lines of sight (with lengths as large as 150 pc) emanating from the Solar position. The main results are: (i) there is a weak distribution of C iv and N v in the regions where O vi is strong, (ii) there is a small amount of C iv and N v ions inside the bubble translating into upper limits of −1.0 of the ratios log[N(C iv)/N(O vi)] and log[N(N v)/N(O vi)], consistent with observations, and (iii) with the lack of heat conduction, turbulent mixing, due to the strong shear between the hotter and cooler regions inside the LB, is responsible for the generation and distribution of these ions.