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Alan,
Given that the Halpha 6763 emission is far larger than any other line (x60 continuum) any image weighted to the visual range spectral response would be red. My attached calibrated visual range spectra shows the prominence of Ha.
Rob, all,
The 2014 periastron campaign is now in full swing, at least from the professional observatories and satellites. Unfortunately I am still the only amateur contributor (when weather allows) so if anyone is willing and able to provide medium resolution (R>4000) high SNR (>200) spectra please contact me. The HeII 4686 emission line, which is of major interest, is now showing the expected high energy wind collision (between primary and secondary stars) that occurs close to periastron.
Cheers,
Bernard
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