Delta Cephei – Cepheid Variable Star and Double Star

Delta Cephei is the prototype Cepheid variable, a class of giant stars that change brightness with periods proportional to their luminosity. You can read more about the variable nature of this star at EarthSky (http://earthsky.org/brightest-stars/delta-cephei-the-kings-famous-variable-star). This image shows the visual binary system. Delta Cephei is the brighter, yellow-toned star, and the companion has a slight bluish color. The blue companion is about 40 arc seconds away and is magnitude 7.5.
 
Tech Specs: Meade 12” LX90, Celestron CGEM-DX mount, Canon 6D stock camera, ISO 3200, 10 second single exposure using Backyard EOS, no darks or bias frames. Image Date: September 4, 2017. Location: The Dark Side Observatory in Weatherly, PA.
 
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…Tom

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