Algol paradox

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In stellar astronomy, the Algol paradox is an apparently paradoxical situation when elements of binary star seem to evolve in discord with the established way of stellar evolution. A dependence pace on mass of the star is a fundamental feature of the process of the evolution of stars. The more greater is mass of the star, a pace of his evolution is faster and more quickly it leave main-sequence and transform into the phase of the subgiant or the giant star. In case of Algol and other binary stars we can observe something completely different. The less massive start is already subgiant and the start with much greater mass still remains on the main-sequence. This situation was called the paradox originally, because stars of the double arrangement are usually rising at the same time and their age should be moved close, and so the more massive star should be more advanced gradually than his less massive companion.

This incompatibility results from the flow of matter appearing often in binary starts between elements. This flow is disturbing fundamentally normal process of the evolution of the star, causing loss of matter through the more massive element for the less massive element. If this flow is taking place at the late stage of the evolution of the more massive element it is becoming the star advanced in the evolution at disproportionately till the age for small mass. At the same time the less massive formerly element is becoming the disproportionately young star gradually in the relationship to one's, enlarged, mass.