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The change in apparent magnitude of a star, according to its spectral class and doppler factor D.
Note that an increase in brightness corresponds to a decrease in stellar magnitude.
Here, each spectral class is mapped internally to a representative absolute temperature in degress Kelvin.
- there's always a value of D for which the brightness has a peak.
- the cooler, redder stars have a greater increase in brightness for doppler factor D>1.
- the hottest, bluest stars get dimmer for almost all values of D.