The bands of LaO appear prominently in the spectra of cool S-type stars and can be used to determine La abundances. We have rotationally analyzed the LaO A²Π-X²Σ⁺ band system up to v=3 in the excited state using PGOPHER. The spectroscopic constants for the ground state were taken from our previous analysis of B²Σ⁺-X²Σ⁺ band system [1]. The band and equilibrium constants for the A²Π state were determined. RKR potentials were calculated and band strengths were obtained using LeRoy’s LEVEL program with an ab initio transition dipole moment. This work also provides calculated radiative lifetimes for v=0 to v=3 of the A state. A line list for the LaO A²Π-X²Σ⁺ transition is provided which can be used to simulate LaO spectra in S-type stars.
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