2025ApJ...987..126B

The spectra of titanium monoxide (TiO) are used to classify M stars. TiO experimental cross sections based on a high-resolution emission spectrum recorded with a Fourier transform spectrometer at the National Solar Observatory are used for the analysis of the TiO B³Π-X³Δ transition ($\gamma ^{\prime} $ system). The 3-2 and 4-3 vibrational bands are analyzed for the first time, and the analysis of the 2-1 band is revised. The transition dipole moment function from an ab initio calculation is used to calculate the band strengths. These band strengths are used to produce a B³Π-X³Δ line list for the vibrational levels v$^{\prime} \leqslant 4$ and v″ ≤ 4, suitable for simulation of astronomical spectra.