Blue loop | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Blue_loop


00:00:53 1 Red giants
00:01:40 2 Asymptotic giant branch
00:02:17 3 Red supergiants
00:02:57 4 Instability strip



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SUMMARY
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In the field of stellar evolution, a blue loop is a stage in the life of an evolved star where it changes from a cool star to a hotter one before cooling again.  The name derives from the shape of the evolutionary track on a Hertzsprung–Russell diagram which forms a loop towards the blue (i.e. hotter) side of the diagram.
Blue loops can occur for red supergiants red giant branch stars, or asymptotic giant branch stars.  Some stars may undergo more than one blue loop.  Many pulsating variable stars such as Cepheids are blue loop stars.  Stars on the horizontal branch are not generally referred to as on a blue loop even though they are temporarily hotter than on the red giant or asymptotic giant branches.  Loops occur far too slowly to be observed for individual stars, but are inferred from theory and from the properties and distribution of stars in the H-R diagram.