Abstract
Equivalent widths, half-widths and central depths of Fe I and Fe II are measured from a high dispersion spectrum of the supergiant δ Canis Majoris. The equivalent widths of the Fe I lines are used in a curve of growth analysis to examine the dependence of the microturbulent velocity on excitation potential. The microturbulent velocity is found to be about 12 km/sec for lines of all excitation potentials. The macroturbulent velocity is derived from the half-widths and central depths of the Fe I lines. It is also found to be independent of excitation potential but the study of the central depths of the Fe I lines indicates a probable dependence of macro-turbulent velocity upon equivalent width. Some reasons are advanced as a possible explanation of this dependence.
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