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Influence of Collisions with Hydrogen on Titanium Abundance Determinations in Cool Stars

Sitnova, T. M.; Yakovleva, S. A.; Belyaev, A. K. +1 more

The possibility of solving the problem of a discrepancy in the non-LTE abundances from Ti I and Ti II lines in metal-poor stars is investigated by applying accurate data to take into account the collisions with hydrogen atoms. For this purpose, we have calculated for the first time the rate coefficients for bound-bound transitions in inelastic col…