The Variation in the Strength of the Calcium H and K

question 3

Multiple Choice

The variation in the strength of the calcium H and K emission from sun-like stars implies that these stars

• A) probably have very extended coronae.
• B) probably have a magnetic cycle similar to the sun's.
• C) do not rotate differentially.
• D) may have planets that orbit them.
• E) probably have supergranules and spicules.

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