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Mira variable
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Mira variables are a class of pulsating stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visu
Mira, the prototype of the Mira variables
Mira, the prototype of the Mira variables
Chi Cygni
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Chi Cygni is a Mira variable star in the constellation Cygnus, and also an S-type star. Its name is a Bayer designation that is Latinized from χ Cygni, and abbreviated Chi Cyg or χ Cyg. It is around 5
Mira variable
…but due to a shifting of energy output between infra-red and visual wavelengths as the stars change temperature during their pulsations. Light curve of χ Cygni. Early models of Mira stars assumed that the star remained spherically symmetric during this process (largely to keep the computer modelling simple…
Illustration of Cygnus from Urania's Mirror, with χ marked as variable
Illustration of Cygnus from Urania's Mirror, with χ marked as variable
The spectacular dimming of Chi Cygni is largely driven by a wavelength shift during its cycle. Even when very dim in visible light it's bright in the
The spectacular dimming of Chi Cygni is largely driven by a wavelength shift during its cycle. Even when very dim in visible light it's bright in the infrared.