On the shell spectrum of 48 Librae
Spectrograms of the variable star 48 Librae, taken near the last expected minimum, have been examined for irregularities of the shell line profiles. The asymmetries and the core-intensity of the strong shell lines suggest some kind of instability in the shell close to 1964. The harmonic spectral analyses of the acceleration and the radial velocity
Arroyo, M. L. et al.
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1980