Suppose the peak wavelength of the star is λmax = 340 nm:
Convert the wavelength to meters: λmax = 3.4×10⁻⁷ m.
Divide the Wien's displacement constant by this value: b / λmax = 2.8977719×10⁻³ m·K / 3.4×10⁻⁷ m.
The resulting temperature is about 8,523 K.
Generally, A-type stars' surface temperature spans 7,400 to 10,000 K.
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