Chi Cygni

Chi Cygni is a red giant star.

Chi Cygni is a Mira variable star located in the Cygnus constellation. It is 737 times larger than the Sun.^[1] Chi Cygni is a red giant star that is about to end its life.

Chi Cygni Media

Illustration of Cygnus from Urania's Mirror, with χ marked as variable
χ Cygni light curve from 2006 to 2010. Note that dates are in the MM/DD/YY format
Visualisation of Mira variable made by "Astrophysics student research club of Gdańsk University of Technology" 2022
Chi Cygni photographed every ~10days during its 10 magnitude luminosity cycle
Changes in the visual magnitude, temperature, radius, and bolometric luminosity as χ Cygni pulsates
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.
Evolutionary track for an intermediate mass star similar to χ Cygni

References

↑ Menten, K. M.. Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles - II. CO line survey of evolved stars: derivation of mass-loss rate formulae. Astronomy & Astrophysics 523 (1 November 2010). p. A18. doi:10.1051/0004-6361/200913771.

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[1] Menten, K. M.. Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles - II. CO line survey of evolved stars: derivation of mass-loss rate formulae. Astronomy & Astrophysics 523 (1 November 2010). p. A18. doi:10.1051/0004-6361/200913771.

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