Solar oscillator strengths for neutral calcium lines of the singlet system.

Physics

Scientific paper

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Oscillator Strengths: Calcium Lines, Oscillator Strengths: Solar Spectrum

Scientific paper

The oscillator strengths of twelve neutral calcium lines of the singlet system were determined by fitting the theoretical equivalent widths and central depths of the lines to those observed in the solar spectrum at the disk center. The neglect of departure from LTE was found to produce uncertainties of about 0.2 dex on the average in the oscillator strengths derived from equivalent widths. The oscillator strengths deduced from central depths turn out to be much mote sensitive to NLTE effects. Uncertainties increase with line depth and are as high as 1.5 dex for the strongest lines.

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