Strömgren Sphere ·
Ionization Balance
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.com · photoionization · recombination · H II region
R_S
∝ (Q/n²)^⅓
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~0.01 pc
Stage
—
Hot O/B star
UV photon (>13.6 eV)
Ionized H⁺
Neutral H I
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.com · Strömgren Sphere