First of all, this question is a bit difficult to answer accurately. After all, I only have decades of experience, and I can only live to be white at most. The history of human observation is only a few thousand years, which is often ten billion years or ten million years compared with that of stars. However, modern astrophysics is almost in its infancy, especially for stars and Supergiant star, and there is a lack of data and quantitative samples. .

Therefore, the answer is no, for reference only.

Let's start with the first question. The mass range of Supergiant star is about 25- 150 solar mass. However, due to internal instability, the luminosity of almost all Supergiant star will change with time. In other words, it will not necessarily change in the end. As we all know, Supergiant star is as meaningful as the typical swordfish S and Haishan II. When the core of a star generates a lot of heat and the outside of the star expands beyond the red giant, a red Supergiant star is formed. In other words, it is not formed by the loss or collapse of Supergiant star, but by the external expansion of stars. So it won't.

The second problem is that in the initial stage, more than 20 times the mass of the sun is generally a superstar. When a large star with an initial mass four times higher than that of the sun re-initiates hydrogen fusion outside the helium nucleus, the energy released outside the nucleus does not increase obviously, but the radius increases many times, so the surface temperature drops from tens of thousands of K to 3000~4000 K, becoming a red Supergiant star. Small and medium-sized stars whose mass is less than 4 times that of the sun enter the red giant stage, and the surface temperature drops, but the luminosity increases sharply. After the formation of the red giant, the helium nucleus is strongly contracted inward by the reaction force, and the compressed matter will continue to heat up. Eventually, the core temperature will exceed 1 100 million degrees, igniting helium fusion. Form a white dwarf in the center. Most of the final products of the mass of red Supergiant star will be iron, most of the mass of red Supergiant star will develop into Wolf-Rayet stars, and the mass of red Supergiant star will eventually become a type II supernova. The mass of red giant stars is usually directly related to the final product of their core, iron. Star hydrogen and helium burn to produce carbon and oxygen, which are then polymerized into neon and magnesium, and then fused with sulfur, silicon and phosphorus to form iron. For a star whose mass is 25 times that of the sun, carbon burns for 600 years, neon is 1 year, oxygen is 6 months, and silicon is only 1 day. The nucleus of iron is special, in which 56 protons and neutrons are closely combined, and the energy required to fuse them is far greater than the energy released by their fusion. Therefore, iron becomes the last ash of the core of a massive star. A star consists of an inner core that has stopped thermonuclear reaction and an outer layer that is still burning one after another. A star must constantly expand its shell to adjust its balance. It will expand to a huge scale and become a red Supergiant star. Therefore, in order to surpass the final iron, capacity system and time effect are not allowed at present, and special circumstances may be observed in the future.

Third, most of the mass loss is not polymerization, but radiation. 120 times the mass of the sun, the iron core collapses, the superstars explode into relics, or gamma ray bursts, or black holes, so the final mass is a bit pitted. .

Fourthly, for the evolution of stars, the most important thing at present is to calculate the evolution mechanism and model of stars from birth to main sequence stars, red giant stars, variable stars, nova (supernovae) and compact stars (white dwarfs or neutron stars or black holes). Herodotus is very important. Most of the stars mentioned above are out of the main sequence, and when a star dies, it will leave the main sequence zone and the star will move to the upper right. This is the region of Red Giant and Red Supergiant star, which are both stars with low surface temperature and high luminosity. Stars passing through the red giant without supernova explosions will move to the lower left over the main sequence area, which is an area with high surface temperature and low luminosity, where white dwarfs are located, and then gradually darken into black dwarf due to energy loss.

This question is really the most tiring typing, and it is very troublesome to express it several times. .

Supercelestial bodies need to learn basic physics and advanced mathematics. Let's go .