Spectral Type
The spectral type of HD 122563 is one of characteristics which initially indicated its peculiarity. In the Bright Star Catalogue its spectral type is given as F8 IV, but its color index indicates a surface temperature much cooler than an F8 star should be. Because the spectral type of a star in the A to K star regime is judged by the relative strengths of the absorption lines of the metals relative to the hydrogen Balmer lines, the extreme metal deficiency results in weak metal lines and yields a spuriously early spectral type. If the spectral classification is performed including the metal deficiency, the result is a rather later type, G8 II Fe-5.
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