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doit_the_clown doit_the_clown
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7 years ago
A classical Cepheid variable star in a distant galaxy has an apparent magnitude of +20.3. By measuring its period and using the period-luminosity relation, its absolute magnitude is –6.0. Assuming that there is no interstellar absorption, what is the distance to the galaxy in parsecs? (See Toolbox 15-1 of Comins and Kaufmann, Discovering the Universe, 7th Ed.)
   A)  3.6 × 104 pc    B)  7.2 × 103 pc    C)  1.1 × 105 pc    D)  1.8 × 106 pc
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Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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discovererdiscoverer
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