Why Is the Hyades Cluster Important for Building Up a Catalog

question 58

Multiple Choice

Why is the Hyades Cluster important for building up a catalog of the true luminosities of main-sequence stars?

• A) It is an extremely bright star cluster.
• B) It is close enough to us that the distance to its stars can be found by stellar parallax.
• C) It is an old globular cluster whose age we can determine very accurately by measuring its main-sequence turn-off point.
• D) It's a cluster that has been photographed over many decades, so we know how the stars vary in brightness.
• E) It contains many Cepheid variable stars that can be used to determine its distance.

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