How does the evolution speed of the Horizontal Branch (HB) and Asymptotic Giant Branch (AGB) phases compare to the initial Red Giant Branch (RGB) ascent?
Answer
They proceed tens of times faster
Once the core begins fusing helium (HB/red clump), the subsequent evolutionary stages, including the AGB phase, accelerate substantially, proceeding tens of times faster than the initial hydrogen shell burning phase on the RGB.
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