Why is the bolometric magnitude of Mira Kita less than the magnitude of its brightness in the visual area?

In the visual region of the spectrum, changes in the brightness of Mira Ceti occur not only due to fluctuations in the temperature and size of the star, but also due to changes in the intensity of powerful bands of titanium oxide. The influence of titanium oxide bands on bolometric and infrared magnitudes is insignificant.

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