The Denouement of Blue Supergiants

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In summary, the conversation discusses the evolution of stars and their movement on the H-R diagram. The main question is whether bright blue main sequence stars, like those in Orion's belt and Spica, will gradually become stars like Rigel or Deneb and then evolve into a Betelgeuse-like star, or if they will suddenly transform into a Betelgeuse-like star. The conversation also touches on the potential fate of Rigel and Deneb, and the discrepancy between the predicted evolution of the sun as a red supergiant versus a red giant. The final point made is that the gravitational attraction may not be enough to overcome radiation pressure in the last stages of a star's life.
  • #1
Simfish
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Hi,

First of all, would very bright blue main sequence stars (for example, the stars in Orion's belt and Spica) first become a star like Rigel or Deneb, and then gradually move towards a star like Betelgeuse in the H-R diagram? Or will they suddenly envelope into a Betelgeuse-like star?

If yes to the first question, then my question is answered. If not, then I have another question.

What exactly were Rigel and Deneb and will they ultimately become a Betelgeuse?

Also, why do so many astronomy textbooks say that the sun will turn into a red supergiant in the last stages of its life? It's only going to have enough mass to become a red giant anyhow.

Thanks!

T_Simfish
 
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  • #2
The gravitational attraction will not be enough to overcome the radiation pressure.
 

What is a "Denouement" in the context of blue supergiants?

A "Denouement" refers to the final phase or resolution of a blue supergiant star's life cycle. It is the stage where the star has exhausted its fuel and begins to collapse, leading to its eventual death.

How long does the denouement phase of a blue supergiant last?

The duration of the denouement phase can vary, but it typically lasts for a few thousand years. This is relatively short compared to the star's overall lifespan, which can span millions of years.

What happens during the denouement phase of a blue supergiant?

During the denouement phase, the core of the blue supergiant star begins to collapse due to the lack of nuclear fusion. This collapse generates immense heat and pressure, causing the outer layers of the star to expand and eventually be expelled into space. This process is known as a supernova explosion.

What are the effects of the denouement of a blue supergiant on its surroundings?

The denouement of a blue supergiant can have significant effects on its surroundings. The supernova explosion can release large amounts of energy and materials into space, which can fuel the formation of new stars and planets. It can also create shockwaves that trigger the formation of new galaxies.

What can studying the denouement of blue supergiants tell us about the universe?

Studying the denouement of blue supergiants can provide valuable insights into the life cycle of stars and the evolution of galaxies. It can also help us understand the processes that shape the universe and the origins of elements that make up the world around us.

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