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Upspectrum variable

alpha2 CVn comparison table
Subject is part of is a kind of is an instance of has definition has period
spectrum variable star Main-sequence Am or Ap stars whose spectra show anomalously strong lines of metals and rare earths which vary in intensity by about 0.1 mag over periods of about 1-25 days. They are characterized by large magnetic fields (103-104 gauss) at the surface, small variations in light and color, and small projected rotational velocities. These peculiarities are sometimes interpreted in terms of an oblique rotator. 
alpha2 CVnCanes Venatici spectrum variableA spectrum variable with spectrum showing strong, profuse lines of rare earths, iron-peak elements, and Si.5.469 days

Upspectrum variable