Over the past decade, a very considerable amount of effort in the understanding of stellar populations has gone. Because a large number of analysed data is the basis of this understanding, our efforts concerning this subject matter presented in this poster are mainly:

–Conception of spectrograph

Multiaperture spectrograph is now a reality on large telescopes. The spectrograph SFM has been achieved in the Observatoire de Marseille and is now at Calar Alto (Baranne et al., 1992). It is used on the German 3.5 m telescope. Such an instrument multiplicates by a large factor the number of observed stars.