EW estimates in Alpy spectra of VV Cep

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Hugh Allen

I used a crude but simple estimate of the EW of the Hα and Hβ emission lines in the VV Cep spectrum, in order to monitor progress of the current eclipse. I drew a ‘continuum’ by extending a straight line between the turning points at the base of the emission lines. As an example here’s the result I got in BASS with last night’s spectrum:

I realise the approach is not strictly scientific but is repeatable and seems to have given a reasonably comparable set of measurements. Here’s the latest time plot of my EW measurements on my own and others’ Alpy spectra:

The latest episode of Hα brightening seems to have appeared bang on time!

I’d welcome any comments on the approach