No abstract

The first multi-color CCD photometric study of 27 δ Scuti stars is presented, which was performed over the three observing years. We obtained the maximum times and magnitude changes in the observation period for each star. The ephemeris of our δ Scuti stars was calculated based on the Markov chain Monte Carlo (MCMC) method, using the observed times of maxima and the period of star oscillations. We used Gaia EDR3 parallax for calculating the absolute magnitude of δ Scuti stars. The precise fundamental physical parameters of all studied stars, such as mass, radius, luminosity, and temperature, were estimated. The pulsation modes of stars were investigated according to their Periodogram, indicating they are all in radial pulsation modes. Since the period changing of pulsating variable stars indicates the stellar evolution, the Period-Luminosity (𝑃 − 𝐿) relation was calculated and discussed. Moreover, we present new 𝑃 − 𝐿 relations for fundamental and overtone modes; Machine Learning Classification was used for this purpose.