* Red Supergiants form from massive stars: Red supergiants are the evolutionary endpoint of stars with initial masses 8 to 40 times that of our Sun. These stars have enough mass to undergo nuclear fusion beyond helium, producing heavier elements in their cores.
* Low-mass stars follow a different path: Low-mass stars, like our Sun, fuse hydrogen into helium in their cores for billions of years. Once they run out of hydrogen, they expand into red giants. They eventually shed their outer layers, leaving behind a white dwarf.
Here's a simplified breakdown of the differences:
Massive Stars:
1. Main Sequence: Fusion of hydrogen to helium in the core.
2. Red Supergiant: Fusion of heavier elements, expansion to enormous size.
3. Supernova: Explosive collapse of the core, leaving behind a neutron star or black hole.
Low-Mass Stars:
1. Main Sequence: Fusion of hydrogen to helium in the core.
2. Red Giant: Expansion due to helium fusion in a shell around the core.
3. Planetary Nebula: Shedding of outer layers, leaving behind a white dwarf.
In summary: Low-mass stars do not have the necessary mass to become red supergiants. Their evolutionary path leads to a different end-stage, characterized by a white dwarf surrounded by a planetary nebula.
