Going green

It is known that the colours of the stars are completely defined, which are blue, white, yellow, orange and red. Stars with a green colour or, more precisely, which appear to be green are less familiar. However, during my observations of binary stars, I noticed some amazing stellar pairs whose accompanying star tends to appear green. Examples include Gamma Andromedae, Delta Herculis, Zeta Lupi and Eta Lupi. Khalid Alburaidi, Kingdom of Saudi Arabia