Will Big Stars Turn Into Red Supergiants or Red Giants?

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    Red giant Stars
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Discussion Overview

The discussion centers on the evolutionary paths of large stars, specifically whether they transition through a red giant phase before becoming red supergiants. Participants explore the definitions of "big" and "medium" stars and the implications of these classifications on stellar evolution.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant asserts that medium-sized stars become red giants, while questioning whether large stars first become red giants before evolving into red supergiants.
  • Another participant notes that the classification of stars as "big" or "medium" is subjective and that there are quantitative studies available that provide more detail.
  • A participant references a diagram illustrating stellar evolution based on initial mass, suggesting it could provide insight into the discussion.
  • Another participant critiques the diagram for only showing the current state of stars without detailing their evolutionary history or mass, indicating that some versions include evolutionary paths but the referenced one does not.
  • Several participants request more explanatory contributions to clarify the discussion rather than debating the linked diagram.

Areas of Agreement / Disagreement

Participants express differing views on the definitions of star classifications and the implications for stellar evolution. There is no consensus on whether large stars pass through a red giant phase before becoming red supergiants.

Contextual Notes

The discussion highlights the ambiguity in defining star sizes and the reliance on diagrams that may not fully represent stellar evolutionary paths. There are unresolved questions regarding the thresholds for classification and the evolutionary processes involved.

Odette
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Hey.
Medium sized stars will turn into red giants.
What about big sized stars? As far as I know they will turn into red SUPERgiants. But, will they pass through a red giant phase before it happens?
In conclusion, will a big star turn firstly into a red giant and secondly into a red supergiant, or will it turn only into a red supergiant?
 
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There are whole books on this. They tend to be more quantitative than just "big" and "medium". Also, they and you probably disagree on how big is "medium" - the most common kind of star, red dwarfs, don't always become red giants, and the threshold is right about at the average star mass.
 
Last edited:
jim mcnamara said:
Look at this diagram, it shows how stars evolve over time, depending on the "starting" mass of the star
http://astronomy.swin.edu.au/cosmos/H/Hertzsprung-Russell+Diagram
No, it does not.
It shows only the present appearance of star, aand gives no information of its history, or mass.
Some versions of this graph add paths to depict star history - but no such are added to the version in the link above.
 
@snorkack
Does the explanation not help? Please post what you think is more explanatory. That would be by far more useful to everyone ...than debating what I linked to. Thanks in advance for for your help.
 

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