The Periods of Type I Cepheids and Type II Cepheids

question 49

Multiple Choice

The periods of Type I Cepheids and Type II Cepheids are different for stars of the same luminosity. What is the physical difference between these stars that causes the periods to be different?

• A) Type II Cepheids are older, having evolved from Type I Cepheids.
• B) The two types have different metallicities.
• C) Type I Cepheids are members of binary systems, whereas Type II Cepheids are solitary stars.
• D) Type II Cepheids have gone through the helium flash, whereas Type I Cepheids have yet to do so.

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Definitions:

Biopsychosocial Approach

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