Estimation of C II and C II* column densities along Galactic sight-lines
Sofia, Ulysses J.; Babu, B. R. S.; Murthy, Jayant; Parvathi, Veena S.
India, United States
Abstract
We present interstellar C II (1334.5323 Å) and C II* (1335.7077 Å) column density measurements along 14 Galactic sight-lines. These sight-lines sample a variety of Galactic disk environments and include paths that range nearly two orders of magnitude in average hydrogen densities (<n(H)>) along the lines of sight. Five of the sight-lines show super-solar gas phase abundances of carbon. Our results show that the excess carbon along these sight-lines may result from different mechanisms taking place in the regions associated with these stars.