Fig. 8
A comparison of the Ondřejov red spectrum of BD+43°1168 taken on HJD 2 456 008.3159 with a spectrum of another B9Iab star σ Cyg, taken with the same instrumentation and kindly put at our disposal by Dr. M. Kraus. Note the strong 6613.56 Å interstellar line in the spectrum of BD+43°1168 and its faint Hα profile, obviously partly filled by emission.
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