The stellar photosphere, the “surface of a star,” is defined as the layer of its atmosphere at an optical depth τλ = 2/3 for a given wavelength λ. But why exactly 2/3?
Note: Definition of Photosphere, Optical Depth and Effective Temperature
The stellar photosphere, the “surface of a star,” is defined as the layer of its atmosphere at an optical depth τλ = 2/3 for a given wavelength λ. But why exactly 2/3?
Note: Definition of Photosphere, Optical Depth and Effective Temperature
