EMPIRICAL IMPROVEMENT IN ACCURACY OF ATOMIC OSCILLATOR-STRENGTHS CALCULATED BY KURUCZ AND PEYTREMANN

A comparison is made between the calculated oscillator strengths of Kurucz & Peytremann and the measures made at Oxford for lines of Fe I, Ti I, Ti II, Cr I, Mn I, Ca I, together with solar Fe II values. It is shown that for individual multiplets, the deviations between the two sets of oscillator strength data are much smaller than the average deviation for all lines of each element. It is proposed that the Kurucz & Peytremann oscillator strengths may be 'calibrated' in this way to give oscillator strengths of improved accuracy which would be more useful for the construction of model stellar atmospheres and for use in spectral synthesis work. Methods for implementing this calibration are suggested. A test of the method using 407 lines of these elements gives, with the omission of a few lines, standard deviations of errors of less than 0.1 dex. A theoretical interpretation of the regularities in errors is discussed. © 1983 Royal Astronomical Society.