S-type Stars: LaO Line List for the B²⁺-X²⁺ Band System

LaO bands are a characteristic feature in the spectrum of cool S-type stars. La is made primarily by the s-process during the asymptotic giant branch phase of stellar evolution. The B-2 Sigma(+)-X-2 Sigma(+) and A(2)Pi-X-2 Sigma(+) band systems can be used to determine the La abundances in cool S stars. The bands of the B-2 Sigma(+)-X-2 Sigma(+) with v' and v '' <= 5 have been rotationally analyzed from an emission spectrum from a carbon furnace. Line strengths are calculated using an ab initio transition dipole function, corrected using experimental lifetimes. We provide a line list for the B-2 Sigma(+)-X-2 Sigma(+) band system that can be used to determine La abundances.