Identify the scientists whose eponymous equations are used to define stellar temperature scales.  
Identify the scientists whose eponymous equations are used to define stellar temperature scales.  a) This equation defining excitation temperature gives the ratio of the number of atoms in two different energy states in terms of the number of degenerate states and his eponymous factor. Name the scientist.
Identify the scientists whose eponymous equations are used to define stellar temperature scales.  
Ludwig {Boltzmann}