Young stars with non-periodic algol-type minima

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Abstract
The irregular variability is one of the most important properties of young stellar objects and is of great interest since its understanding is the key to understanding the physics of young stars. The main question is: how to separate, in each concrete case, the different potentially important mechanisms of the variability, such as the variable circumstellar extinction, the flare (and chromospheric) activity, and the suppression of stellar photosphere by the formation of magnetic spots? We consider this question below in application to an interesting subclass of young stars, the stars with non-periodic Algol-type minima. The most important results of current investigations of these stars are discussed.