F stars

F stars

Stars of spectral type F that are white with a surface temperature (T eff) of about 6000 to 7400 kelvin. The hydrogen lines in the spectrum weaken rapidly and the lines of ionized calcium (Ca II, H and K) strengthen from F0 to F9; there are many lines of neutral and singly ionized metals and heavy atoms. Canopus, Polaris, and Procyon are F stars.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006