Abstract
An experimental Fairchild CCD-211 was placed in the 2.1 m coude spectrograph at the Kitt Peak National Observatory and used to record an 87 Å spectral band centered on Hα. On the night of 1979 July 11 UT date, this system was used to observe continuously the extreme 8 Cephei variable BW Vulpeculae throughout one of its 4<sup>h</sup>49<sup>m</sup> cycles with an average exposure of 13 minutes per observation. A total of 18 observations was secured. The results show dramatic profile variations of Hα, including features not previously reported, and extreme variations of the C II λλ6578, 6582 lines, including variations of equivalent width. The fast time resolution capability and the photometric linearity of the CCD has permitted the detection of subtle effects which have been missed by photographic observations, and has led directly to important new interpretations of the complex atmospheric pulsations in this star.
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