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How Do Cepheid Variables Pulsate?
š” The Answer
- The star expands and contracts due to helium ionization zones that trap and release radiation.
- Helium alternately becomes more opaque then transparent, regulating energy flow.
- Pulsation periods range from days to months, depending on star's mass and luminosity.
- This regular rhythm is what makes Cepheids reliable distance indicators.
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