Spectral class      peak wavelength           temperature
                        (Angstroms)              (approx)
----------------------------------------------------------------

   B0V                  < 2000                  >  14,500

   A0V                 hard to say               

   G5V                    4500                      6,400

   K3V                    6000                      4,800

   M2V                    9500                      3,100
----------------------------------------------------------------