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H\alpha\ equivalent widths and UBV magnitudes are calculated for Be star diskmodels that grow in size and/or density with time. We show that these simplemodels are consistent with the known Be star classes of positive and inversecorrelations between long-term variations in H\alpha\ and V magnitude asidentified by Harmanec. We support the conclusion of Harmanec that thedistinction is controlled by the inclination of the disk to the line of sight.We demonstrate that the strength of these correlations, particularly those ofan inverse correlation where the system becomes fainter as the H\alpha\emission strength grows, is strongly influenced by the scale height of theinner Be star disk and the extent of the gravitational darkening of the centralB star due to rapid rotation. This dependence may allow coordinatedspectroscopic and photometric observations to better constrain these poorlyknown Be star parameters.

The Correlation Between H\alpha\ Emission and Visual Magnitude During Long-Term Variations in Classical Be Stars