VX Hya time keeping. Stroboscopic analysis
2021
Photometric observations of the double-mode pulsator VX Hya are presented. They are analyzed with a stroboscopic method, completed by Fourier analysis. It is found that, while the fundamental pulsation is relatively stable, the overtone is more erratic. A sudden change in the pulsations in 2016-18 is also discovered.
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