4 Spectrophotometry

In Table 1, the equivalent widths of component A1 are given. For He I 4922, the values scatter around a mean value of 0.29 Å with a standard deviation of 0.06 Å, while the accuracy of individual values is certainly better than 10%, so some intrinsic variability of the line strengths has to be present. No dependence on phase is apparent. The average value of the width of the A1 component of He I 4713 is 0.27 Å.

The equivalent widths of He I 4713 and 4922 lines of other components are also variable, as is apparent from Fig. 3. For B1 the average value of He I 4922 is 0.10 Å. The maximum EW of the emission seen in the He II 4686 line of component B1 is 0.03 Å.