OSCILLATOR-STRENGTHS FOR THE TRANSITIONS IN CA XIII

The absorption oscillator strengths for a number of transitions among LS states and the fine-structure levels calculated using extensive configuration interaction in the wave functions are reported. The relativistic results are obtained adopting an intermediate-coupling scheme through the use of the terms of the Breit-Pauli Hamiltonian. In general, there is very good agreement between length and velocity forms of the oscillator strengths and the energies obtained using these wave functions compare very well with the observed values. The comparison of the oscillator strengths calculated in the present work with the other available calculations shows good agreement. Also reported are accurate results for many astrophysically important transitions involving quintet states. It is noted that spin-spin and spin-other-orbit terms of the Breit-Pauli Hamiltonian have considerable effect on the f values for the intercombination transitions.