Old stars with low mass

   To date not known accurately, what happens to light the stars after the depletion of hydrogen. Since the age of the universe is 13.7 billion years, which is insufficient for the depletion of hydrogen fuel, advanced the theory based on computer modeling of processes occurring in such stars.

   Some stars can synthesize helium, only a few active sites, which causes instability and strong solar winds. In this case, education is not a planetary nebula, a star, only to evaporate, becoming even smaller than the brown dwarf.

   But the star has a mass less than 0.5 solar will never be able to synthesize helium even after the end of the nucleus reactions involving hydrogen. Stellar shell they had not sufficiently massive to overcome the pressure produced by the nucleus. These stars are the red dwarfs (such as Proxima Centauri), which stay on the main sequence of hundreds of billions of years. After the termination of their nucleus fusion reaction, they gradually ostyvaya will continue to radiate weakly in the infrared and microwave bands in the electromagnetic spectrum.