Why are Cepheid variable stars so important?
Chapter Questions
1) What do we mean by standard candle? Explain how we can use standard candles to measure distances.
2) Why are Cepheid variable stars so important?
3) Suppose you are observing Cepheids in a nearby galaxy. One Cepheid has a period of 10 days between peaks in brightness and another has a period of 30 days. Based on Fig. 20.12, what is the luminosity of each star?
4) An astronomer is scanning the sky for massive star supernovae. In which type of galaxy would he be most likely to observe a supernova: in a giant elliptical galaxy or in a large spiral galaxy? Explain your reasoning.
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