why do main sequence stars become supergiants ?

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https://en.wikipedia.org/wiki/Supergiant

Supergiant star – Wikipedia
https://en.wikipedia.org/wiki/Supergiant
Supergiants develop when massive main-sequence stars run out of hydrogen in their cores, at which point they start to expand, just like lower-mass stars. Unlike lower-mass stars, however, they begin to fuse helium in the core smoothly and not long after exhausting their hydrogen. This means that they do not increase their luminosity as dramatically as lower-mass stars, and they progress nearly horizontally across the HR diagram to become red supergiants. Also unlike lower-mass …

https://www.thoughtco.com/stars-and-the-main-sequence-3073594

Life on the Main Sequence: How Stars Evolve
https://www.thoughtco.com/stars-and-the-main-sequence-3073594
Leaving the Main Sequence . When stars run out of hydrogen, they begin to fuse helium in their cores. This is when they leave the main sequence. High-mass stars become red supergiants, and then evolve to become blue supergiants. It’s fusing helium into carbon and oxygen. Then, it begins to fuse those into neon and so on. Basically, the star becomes a chemical creation factory, with fusion occurring not just in the core, but in layers surrounding the core.

https://courses.lumenlearning.com/astronomy/chapter/evolution-from-the-main-sequence-to-red-giants/

Evolution from the Main Sequence to Red Giants | Astronomy
https://courses.lumenlearning.com/astronomy/chapter/evolution-from-the-main-sequence-to-red-giants/
More massive stars complete each stage of evolution more quickly than lower-mass stars. The fusion of hydrogen to form helium changes the interior composition of a star, which in turn results in changes in its temperature, luminosity, and radius. Eventually, as stars age, they evolve away from the main sequence to become red giants or supergiants. The core of a red giant is contracting, but the outer layers are expanding as a result of hydrogen fusion in a shell outside the core. The star …

https://users.physics.unc.edu/~gcsloan/fun/star.html

G. C. Sloan: Main Sequence Stars, Giants, and Supergiants
https://users.physics.unc.edu/~gcsloan/fun/star.html
Main Sequence Stars, Giants, and Supergiants Main sequence stars. Eventually, the interior of a forming star gets so hot, thermo-nuclear fusion reactions begin in… Red giants. When all of the hydrogen in the core of a star has been converted to helium, there is nothing left to… Horizontal branch …

https://www.quora.com/What-causes-main-sequence-stars-to-become-red-giants?share=1

What causes main sequence stars to become red giants? – Quora
https://www.quora.com/What-causes-main-sequence-stars-to-become-red-giants?share=1
Main sequence stars become red giants do to a change in hydrostatic equilibrium. When a star is in hydrostatic equilibrium, the outward pressure of the nuclear reactions and the inward force of the star’s own gravity. When the star runs out of fuel, it contracts. This brings fuel from the outer layers of the star into the core where it is fused, causing massive amounts of outward pressure that expands the star into a cool, red giant.

https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Book:_Astronomy_(OpenStax)/22:_Stars_from_Adolescence_to_Old_Age/22.01:_Evolution_from_the_Main_Sequence_to_Red_Giants

22.1: Evolution from the Main Sequence to Red Giants …
https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Book:_Astronomy_(OpenStax)/22:_Stars_from_Adolescence_to_Old_Age/22.01:_Evolution_from_the_Main_Sequence_to_Red_Giants
More massive stars complete each stage of evolution more quickly than lower-mass stars. The fusion of hydrogen to form helium changes the interior composition of a star, which in turn results in changes in its temperature, luminosity, and radius. Eventually, as stars age, they evolve away from the main sequence to become red giants or supergiants. The core of a red giant is contracting, but the outer layers are expanding as a result of hydrogen fusion in a shell outside the core …

https://study.com/academy/lesson/star-formation-main-sequence-dwarf-giant-stars.html

Star Formation: Main Sequence, Dwarf & Giant Stars – Video …
https://study.com/academy/lesson/star-formation-main-sequence-dwarf-giant-stars.html
Average stars become red giants, turn into planetary nebulae, and end their lives as white dwarfs. Massive stars become red supergiants, undergo a supernova explosion, and become either a neutron…

https://brainly.com/question/17747296

Why do some stars become red supergiants? – Brainly.com
https://brainly.com/question/17747296
Why do some stars become red supergiants? See answer samuel536 is waiting for your help. Add your answer and earn points. Kglaze0195 Kglaze0195 Answer: Eventually, as stars age, they evolve away from the main sequence to become red giants or supergiants. The core of a red giant is contracting, but the outer layers are expanding as a result of hydrogen fusion in a shell outside the core. The …

https://www.universetoday.com/122807/why-do-red-giants-expand/

Why Do Red Giants Expand? – Universe Today

Why Do Red Giants Expand?

The star begins to contract, the gravitational energy heats up again, allowing another shell of hydrogen to have the pressure and temperature for fusion, and then we’re back in business! Red …

https://astronomy.stackexchange.com/questions/34533/name-for-pre-supergiant-main-sequence-stars

Name for pre-supergiant main sequence stars – Astronomy …
https://astronomy.stackexchange.com/questions/34533/name-for-pre-supergiant-main-sequence-stars
The massive main-sequence stars which turn into supergiants–do they typically have special terminology for their classifications as do the less massive ones (which may be, e.g., yellow dwarf or red dwarf)? Just non-dwarf main sequence or? (I’m quite a novice, so pardon me if my premises are wrong too. Just trying to get a sense of some of the broad categories.)