Spectroscopic Observations of AX Persei, RW Hydrae, CI Cygni, and Z Andromedae.

Data concerning the intensities and displacements of the chief bright lines in the blue-violet portion of the combination spectra of AX Per 013053, RW Hya 132824, CI Cyg 194635, and Z And 232848 are re- ported in considerable detail. Lines observed include those of H, He i, He u, N m, [0 ni], [Ne m], Fe U, [Fe v}, and [Fe vu]. Bright-line stars with absorption spectra of late type may be arranged in five groups. Those charac- terized by bright lines of He ii and/or [0 ml, [Ne iii] are called "combination spectra." Data concern- ing probable periodic variations in the displacements of the bright lines in six combination spectra are summarized. Tentative generalizations are: (1) The displacements of most, if not all, of the lines are variable. (2) A typical range is 30 km/sec. Permitted lines exhibit smaller ranges than forbidden lines. (3) The fluctuations are of long period (one to three years). (4) Maxima and minima of the forbidden lines occur about one-fifth of the period after the corresponding phases of permitted lines