ACCURATE OSCILLATOR-STRENGTHS OF ASTROPHYSICAL INTEREST FOR NEUTRAL OXYGEN

Knowledge of accurate oscillator strengths in neutral oxygen is of crucial importance in astrophysics. The accurate determination of the solar abundance of O I, which remains the primary source for the entry in cosmic abundance tables, requires the use of E1 transitions appearing in the solar photospheric spectrum. A new accurate scale of oscillator strengths has therefore been obtained for the 2p3(4S)nl-2p3(4S)n'l' transitions of O I of astrophysical interest. Configuration interaction effects have been considered in a detailed way. The results have been used to improve the solar abundance determination for oxygen. The new result is A(O) = 8.86 +/- 0.04 (in the usual logarithmic scale).