Cepheid Variables

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Questions

• What is a cepheid variable?
• How are cepheid variable stars found?
• How are cepheid variable stars used in astronomy?
• How are cepheid variable stars used in determining distances?
• Why are cepheid variables important?
• How are cepheid variables related to the instability strip?
• How can a cepheid variable indicate distance?
• How can cepheid variables be used to find distance?
• What are cepheid variable stars and why are they important?
• Where are the cepheid variables? Can we see any from earth without a telescope?
• How can astronomers use variable stars to find distance?
• How does the pulsation of cepheid variables allow astronomers to estimate age?
• Why are Cepheid variable stars important to astronomers? How is the information they impart any more or less useful than using stellar parallax?
• Suppose we observe a Cepheid variable in a distant galaxy that brightens and dims with a regular period of about 10 days. What can we learn from this observation?
• Why do cepheid variables pulse and how does this pulsate help calculate distance?
• If a cepheid variable in a nearby galaxy is 106 times fainter than an identical one in the Milky Way, how far away is it?
• A cepheid variable star has a period of 4 days. What is the luminosity in solar units?
• Why are cepheid variable stars important in our study of the Milky Way?
• Why is a cepheid variable star referred to as a standard candle?
• Are cepheid variable stars brighter than the sun?
• How does knowing the period of variability of a Cepheid Variable star allow us to determine its absolute magnitude?
• A cepheid variable in a nearby galaxy looks "10^6" times fainter than an identical Cepheid in the Milky Way? The Cepheid in the Milky Way is 1000 parsecs away. How far away is the nearby galaxy?
• What causes the pulsation of a cepheid-type variable star?
• How does knowing the period of a variable star helps us know its luminosity?
• How did Hubble use cepheids to measure the distance to M31 and other galaxies?
• What is a Cepheid variable star and what makes it variable?
• What is the connection between a Cepheid variable star's pulse and its brightness?
• How can we use Cepheid variables and supernovae to determine stellar distances?
• How can we use Cepheid variables and supernovae to determine stellar distances?
• What is the absolute magnitude of a type 1 cepheid variable star which has a period of 30 days?
• How does a cepheid variable differ from other stars?
• How do cepheid stars pulsate?
• How are cepheid variables used?
• What are cepheid variable stars used for?
• What are cepheid variables?
• What are cepheid variables used to determine?
• Why are cepheid variables known as standard candles?
• Why do cepheid stars pulsate?
• What are stars that pulsate in and out called?
• What enables stars to pulsate?
• How do variable stars pulsate?