Abstract
One of the most important problems connected with the observation of irregular variable stars is that of spectroscopic time resolution. In a star whose variable properties are not repeated in a predictable manner it is essential to make continuous observations until the time scale and magnitude of its variations become apparent. In addition, high time resolution observation may reveal short time variation in properties of stars previously thought to be stable. It is known that many early type stars for instance, especially those having emission lines (and hence extended atmospheres), show changes in their spectra, but until we can watch such changes taking place we cannot expect to explain their occurrence.
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