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Questions regarding large spheres of plasma undergoing fusion.
3
votes
1
answer
520
views
Why Helium-burning Stars are found in a Horizontal Branch?
Why Helium-burning stars are found in a horizontal branch on the H-R diagram? Why do they have roughly the same luminosity?
11
votes
2
answers
888
views
Why is the track of the subgiant stage almost horizontal on the HR diagram?
The star will appear to cool slowly and will undergo a modest increase in luminosity. … During this phase, the path the star will follow in the HR diagram is almost horizontal to the right of its position on the Main Sequence. Stars in this phase are usually referred to as subgiants. …