Tip of the Red-Giant Branch · Standard Candle
unseel.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
Unseel.com · Tip of the Red-Giant Branch