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Observations date |
equipment |
detail |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα |
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0.28- |
HeI @ 6678Å |
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0.28- |
Hα + HeI @ 6678Å |
Gamma Cassiopeiae is an eruptive variable star, whose apparent magnitude changes irregularly between +1.6 and +3.0. It is the prototype of the class of Gamma Cassiopeiae variable stars. In the late 1930s it underwent what is described as a shell episode and the brightness increased to above magnitude +2.0, then dropped rapidly to +3.4. It has since been gradually brightening back to around +2.2. At maximum intensity, γ Cassiopeiae outshines both α Cassiopeiae (magnitude +2.25) and β Cassiopeiae (magnitude +2.3).
Gamma Cassiopeiae is a rapidly spinning star with a projected rotational velocity of 472 km s−1, giving it a pronounced equatorial bulge. When combined with the star's high luminosity, the result is the ejection of matter that forms a hot circumstellar disk of gas. The emissions and brightness variations are apparently caused by this "decretion" disk.
Cassiopeiae
FITS files are available in BeSS-