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physical object > natural object > celestial body > star > variable > periodic variable > RV Tau variable
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RV Tau variable comparison table
Subject has spectral type has period is a kind of has definition
periodic variable  variable 
RV Tau variableG star, K star60 - 100 daysperiodic variablePeriodic variable with periods 60-100 days, and of spectral types G and K.

Next periodic variablebeta Cephei star    Upperiodic variable    Previous periodic variableRR Lyrae star