  Spectral bands for the B(2)$^{2}\Sigma^{+}\rightarrow$ X(1)$^{2}\Sigma^{+}$
electronic transition in the doubly-polar open-shell KSr molecule are recorded
at moderate resolution using the thermoluminescence technique. The spectra are
simulated using three kinds of advanced electronic structure calculations,
allowing for an assessment of their accuracy on one hand, and for the
derivation of fundamental spectroscopic constants of the X(1)$^{2}\Sigma^{+}$
KSr ground state and the excited electronic state B(2)$^{2}\Sigma^{+}$, on the
other hand. These results should facilitate further studies aiming at creating
ultracold bosonic or fermionic KSr molecules.
