ИСТИНА

Detection and classification of variable stars of various types require numerous routine daily observations. Usually the lack of observational time, dur to the many observational programs in observatories throughout the world (especially on large telescopes), does not permit professional astronomers to provide such regular observations. However, the public interest in various astronomical objects, such as Novae, Supernovae, X-ray transients, Black Holes and so on, has substantially increased in recent years; the study of cataclysmic variables is a particularly attractive field of investigation for amateur astronomers, due to the very interesting properties which these objects manifest. The detection of outbursts of Novae, Dwarf Novae, and even Supernovae, represents a good example of collaboration between amateur and professional astronomers. The various observational campaigns which were organized in different countries are the best evidence of succesful work of such kind. The well-known sites, such as VSNet, AAVSO and etc., both permit professional astronomers to know the right moment for making observations and supply them with numerous data helping detailed analysis of different objects.