Tip of the Red-Giant Branch ·
Standard Candle
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.com · helium flash · M_I ≈ −4.0 · edge detection
Tip mag
M_I ≈ −4.0
Core
0.47 M☉
Step
—
Halo red giants
Helium flash / tip
Luminosity function edge
Distance / H₀
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.com · Tip of the Red-Giant Branch