Fig. 1.
Montage of classification spectra (Wd1-74, -373 and W1015) and apparent SB2 binaries. Note the shallower, flat-bottomed photospheric profiles for Wd1-36, 53a and W1041 in comparison to the templates, indicative of unresolved SB2 systems. Two spectra are presented for Wd1-10 to demonstrate the pronounced line profile variability in the Paschen-11 and -12 photospheric lines, which transition from doubled- to single-troughed in the 11 days between the observations.
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