The helium flash shows up on the H- R diagram on the way to the horizontal branch.

Name: The helium flash shows up on the H- R diagram on the way to the horizontal branch.
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The helium flash is a brief but intense period of helium fusion in the core of a low-mass star. It occurs after the star has moved off the main sequence and is on its way to the horizontal branch of the H-R diagram, where it will burn helium in its core more steadily.

The Helium Flash Shows Up on the H- R Diagram