AbstractThe interstellar lines of Call (K) and NaI (D) are the main means used to estimate the distance of the Ap star ET And to derive its position in the HRD, because the classical methods for the determination ofMare affected by some restrictions. By these means the star lies distinctly above the main sequence. The post‐main sequence evolutionary stage suggests to assume that pulsations are the reason for the observed short‐time spectroscopic and photemetric variations. Possibly, the 1.61‐day period is also caused by pulsa