Petersen Diagram ·
Two Tones, One Star
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.com · P₁/P₀ vs P₀ · double-mode pulsators
P₁/P₀
—
f₁/f₀
≈ 1.34
Stage
—
Fundamental (P₀, no node)
First overtone (P₁, 1 node)
Metal-poor ribbon (high ratio)
Metal-rich ribbon (low ratio)
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.com · Petersen Diagram