Delta Cepheid variable stars

http://astrothesaurus.org/uat/368

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Delta Cephei stars
Delta Cephei variables
Delta Cepheids
Population I Cepheids
Type I Cepheids
dcterms modified equal to or less than 2020-11-05T15:47:55.117Zequal to or more than 2020-11-05T15:47:55.117Z
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http://astrothesaurus.org/uat/218 original
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368 original
definition The prototype of classical Cepheid variables, which is a pulsating yellow supergiant. John Goodricke was the first in 1784 to discover its variability. The star shows a quick and sharp rise from minimum to maximum, and slowly declines to its minimum again. The changes in brightness are accompanied by and principally caused by changes in stellar temperature and also by changes in radius. δ Cephei was actually the second Cepheid variable to be discovered. The first one, Eta Aquilae, had been discovered earlier the same year by Edward Pigott. δ Cephei varies with a period of 5.366341 days (or 5 days 8 hours 37.5 minutes) from magnitude 3.48, spectral type F5 Ib in its maximum to magnitude 4.37, spectral type G2 Ib in its minimum. It lies at a distance of 1,340 light-years.
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contributor AAS_Frey.Katie_Admin original