Why Should the Period-Luminosity Relationship Be Different for Type I

question 50

Multiple Choice

Why should the period-luminosity relationship be different for Type I Cepheids and Type II Cepheids?

• A) Type II Cepheids are dwarf stars and thus much less luminous than Type II giants.
• B) Type I Cepheids are metal-rich and thus have more heavy elements in their atmospheres.
• C) Type II Cepheids are metal-rich and thus have more heavy elements in their atmospheres.
• D) Type I Cepheids get their energy primarily from hydrogen fusion while Type II Cepheids get their energy primarily from helium fusion.

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