OB-Assocoations and Molecular Clouds

Physics

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Scientific paper

The discovery of existence of stellar associations was crucial in elucidation of star formation processes. Before the works of Ambartsumian the widespread idea was that the stars are born together and will die together, but Ambartsumian showed that the star formation processes are continuous events, which took place in the past, take place at present time and will take place in the future, in stellar associations. During last 30 years the connection of stellar associations with molecular clouds became obvious. Ambartsumian: "My opinion is that the future observations will show, that the stellar associations and expanding nebulae are forming together. I suppose that we must refuse the old idea of formation of stars out of diffuse matter and presume, that the diffuse matter as well as the stars are forming together as a result of disintegration of protostars". The stellar associations are concentrated mainly in the disc of our Galaxy in the molecular ring R = (4-8) kpc. An OB-association is also present in the very center of our Galaxy - near the central object Sgr A*. Still in 1937 Ambartsumian wrote [1]: "Investigation of above mentioned four types of objects shows the way in which the evolution of many stars takes place. These are explosions, accompanied by ejection of large amounts of material, and continuous outflow of matter".

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