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The resulting - diagram is presented in Figures 53 and 54 (upper panel) for , and in Figsures 53 and 54 (lower panel) for .
Figure 53: The - curves for all SN types for (left-hand panel) and (right-hand panel) (Jorgensen et al., 1996).
Figure 54: The - curves for 4 SN types for (upper panel) and (lower panel) (Jorgensen et al., 1996).
As the SN activity in the first generation stellar population must be small at present, the net SN rate in the vicinity of the Sun is approximately proportional to the local density of stars of second generation (or to the star formation rate, which is the same), especially for SN II and SN Ib.
If a -like star formation of the first generation stars took place, a hump on the observed - showing the relative fraction of the first generation stars should be observed.
We conclude that the analysis of the observed - could potentially provide us with important information on the fraction of first generation stars (if any), the history of star formation rates and the parameters of the evolution model.