An interesting discussion among professional Be star disk researchers has, for years, been the
question of correlation between the Hα equivalent width (EW) to the UBV brightness.
An report about this topic is written in:
http://astrospectroscopy.de/HalphaversusV.pdf
Ernst Pollmann
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Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
Halpha emissions and V correlations in Be star disks
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