 The two sets of spectral lines are almost identical and both stars are assigned a spectral type of K0III, meaning they have evolved into giants.They are considered to be red clump giants, stars that have begun core helium fusion and lie on the horizontal branch but because of their metallicity and the size of their hydrogen envelope they are found very close to the red giant branch.The two stars are assumed to have the same age, which would be around 650 million years.