Abstract
An investigation of Pickering’s reproduction of this spectrum— which apparently consists of the spectrum of an Orion star + bright hydrogen lines and certain other bright lines of minor intensity- suggested that the latter are radiation lines corresponding to some of the stronger absorption lines of α Cygni. These α Cygni lines have previously been attributed to the enhanced lines of certain metals, chiefly Fe, Ti, Cr, Mg, and Si. A close investigation has now shown that nearly all the most marked bright lines in μ Centauri—other than those of hydrogen—occupy positions closely corresponding to those of the most conspicuous enhanced lines of iron. The wave-lengths of some of the bright u Centauri lines are compared with those of the enhanced lines of iron and α Cygni lines in the table at the end of this note. The close agreement is very noticeable.
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