Corotation: its influence on the chemical abundance pattern of the   Galaxy
  A simple theory for the chemical enrichment of the Galaxy which takes into account the effects of spiral arms on heavy elements output was developed. In the framework of the model with the corotation close to the position of the Sun in the Galaxy the observed abundance features are explained. 
Yu.N.Mishurov (1), J.R.D.Lepine (2), I.A.Acharova (1) ((1) Rostov   State University, Russia, (2) Institute of Astronomy and...