Abstract
The hypothesis of a white hole actively ejecting matter and energy through a wormhole was first substantiated by I. Novikov in 1964 based on the theory of relativity. It is possible extend some of the characteristics of a white hole to objects of classical astrophysics – stars. A star can be classified as a gray hole if it ejects matter at a speed exceeding the gravitational limit. For this, the star must have energy and a driving force that allows it to overcome gravity. There is a lot of thermal energy on hot stars. And the combination of gravity and a significant difference in the thermal velocity of electrons and ions leads to polarization in the star's atmosphere and forms a Coulomb accelerator on hot stars, which converts thermal energy into electromotive force. The presence of an accelerator on the surface of a star allows us to consider a new class of objects - a "Coulomb gray hole" for non-relativistic hot stars. The observable sign of a Coulomb gray hole will be the presence of an ion flow from the star, significantly exceeding the gravitational limit.