Observational and Theoretical Studies of 27 $\delta$ Scuti Stars with Investigation of the Period-Luminosity Relation

Abstract

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.

5 Figures, 6 Tables, Accepted in the PASP journal

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Cited by in corpus (10)

• Gaia Data Release 3: Pulsations in main sequence OBAF-type stars
• Revisiting bright delta Scuti stars and their period-luminosity relation with TESS and Gaia DR3
• Discovery of Delta Scuti variables in eclipsing binary systems II.Southern TESS field search
• Identifying 850 delta Scuti pulsators in a narrow Gaia colour range with TESS 10-minute full-frame images
• Statistical analysis of asteroseismic indices and stellar parameters of TESS-observed $\delta$ Scuti stars
• KIC 10855535: An elegant Delta Scuti pulsator with Amplitude and Phase Modulation
• Discovery of a Short Period Pulsator from Istanbul University Observatory
• The OmegaWhite Survey for Short Period Variable Stars VI. Open Clusters
• Investigating the Period-Luminosity Relations of delta Scuti Stars: A Pathway to Distance and 3-D Dust Map Inference
• Discovery and Characterization of Three New High-amplitude delta Scuti Stars from TESS Observations