How can you explain the change in the brightness of new stars?

New stars increase in several days the luminosity L by 10,000 times, duration from several hours to several months, brightness amplitude from 7m to 11m. New stars are binary stars located very close to each other. One of the stars is a white dwarf (neutron star), the other is a giant. White dwarfs do not contain hydrogen; they are composed of helium and heavier elements. During accretion, hydrogen from the giant star flows into the white dwarf, which leads to the heating of the degenerate gas of the white dwarf to a temperature of 15-20 million K, necessary for the start of a thermonuclear reaction, an explosion occurs.

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