This extremely dense white dwarf will absorb hydrogen from the companion star, which is the red giant. When the absorbed hydrogen reaches a certain amount, a nova explosion will occur. Although the nova explosion is not as good as a supernova explosion, it is still a relatively good astronomical event suitable for observation.
The binary star system is called T Corona Borealis (TCrB). It is calculated that a new star will explode approximately every 80 years. Astronomers expected this explosion to be in September 2024, but it did not explode at that time.
Now astronomers use observation data to give a new prediction time. The T Nova Borealis will explode on March 27, 2025 (Thursday). If it successfully explodes, its brightness will last for a week in the sky. After the explosion, the brightness will first reach a peak, and then gradually dim until the next explosion 80 years later.
Astronomers have also given different prediction times. If there is no explosion this Thursday, it may still explode on November 10, 2025 and June 25, 2026. However, there are many conditions for nova explosions, and the prediction time is for reference only.
If the outbreak is successful, humans on Earth will be able to see a bright star appear in the northern hemisphere sky with the naked eye. The constellation Corona Borealis is in the shape of an arc. For details, you can refer to the celestial body table below. The green dot is T Corona Borealis.
The final outcome of T Corona Borealis:
The final outcome of a red giant star is also a white dwarf, so in the future this binary star system will become two white dwarfs orbiting each other. The brightness of the white dwarf stars is very low, making it very difficult to observe with the naked eye. After most of the hydrogen gas is exhausted, there will be no more nova explosions.
The two white dwarfs then continue to orbit for billions of years. If they are lucky enough not to be swallowed by the black hole, they may eventually collide. At that time, either a supernova explosion (forming a neutron star) or a new supernova will be formed, depending on their mass.