Abstract
We have analyzed all the reliable photometric data sets available in the bibliography for a selected sample of monoperiodic high‐amplitude δ Scuti stars in order to study the stability of their light curves. A total of 169 data sets and more than 22,000 points have been considered for seven stars: ZZ Mic, EH Lib, BE Lyn, YZ Boo, SZ Lyn, AD CMi, and DY Her. The results do not reveal significant long‐term changes of amplitude of the light curves for any of these stars.

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