The temperature a star would have if it were a perfect blackbody radiator emitting the same total amount of energy per unit surface area. This temperature determines the star's color and spectral characteristics.
The term combines 'effective' (from Latin 'efficere' meaning to accomplish) with temperature, emphasizing that this is the temperature that effectively describes the star's radiation. The concept emerged in early 20th-century stellar physics as scientists developed blackbody radiation theory.
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