  The multi-color CCD photometric study of 27 Delta Scuti stars is presented.
By using approximately three years of photometric observations, we obtained the
times of maxima and magnitude changes during the observation time interval for
each star. The ephemerides of our Delta Scuti stars were calculated based on
the Markov Chain Monte Carlo (MCMC) method using the observed times of maxima
and the period of the stars' oscillations. We used the Gaia EDR3 parallaxes to
calculate the luminosities and also the absolute magnitudes of these Delta
Scuti stars. The fundamental physical parameters of all the stars in our sample
such as masses and radii were estimated. We determined the pulsation modes of
the stars based on the pulsation constants. Moreover, the period-luminosity
(P-L) relation of Delta Scuti stars was investigated and discussed. Then, by
using a machine learning classification, new P-L relations for fundamental and
overtone modes are presented.
