Difference between revisions of "Cepheid"
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A '''Cepheid''' is a pulsating variable star. This type of star undergoes a rhythmic pulsation as indicated by its regular pattern of changing brightness as a function of time. The period of pulsation has been demonstrated to be directly related to a Cepheid's intrinsic brightness making observations of these stars one of the most powerful tools for determining distance known to modern day astronomy. The existence of this period-luminosity relationship was a point of contention during the 1920 [[Curtis-Shapley debate]]. | A '''Cepheid''' is a pulsating variable star. This type of star undergoes a rhythmic pulsation as indicated by its regular pattern of changing brightness as a function of time. The period of pulsation has been demonstrated to be directly related to a Cepheid's intrinsic brightness making observations of these stars one of the most powerful tools for determining distance known to modern day astronomy. The existence of this period-luminosity relationship was a point of contention during the 1920 [[Curtis-Shapley debate]]. | ||
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| + | == Sources == | ||
| + | [http://apod.nasa.gov/apod/lib/glossary.html#cepheid APOD Glossary] | ||
[[Category:Astronomy]] | [[Category:Astronomy]] | ||
Revision as of 02:11, June 8, 2007
A Cepheid is a pulsating variable star. This type of star undergoes a rhythmic pulsation as indicated by its regular pattern of changing brightness as a function of time. The period of pulsation has been demonstrated to be directly related to a Cepheid's intrinsic brightness making observations of these stars one of the most powerful tools for determining distance known to modern day astronomy. The existence of this period-luminosity relationship was a point of contention during the 1920 Curtis-Shapley debate.
