Period Variation Rates of Four Radial Single-Mode High-Amplitude Delta Scuti Stars

Abstract

In this work, we present a study on the long time-scale period variations of four single-mode high-amplitude delta Scuti stars (HADS) via the classical $O-C$ analysis. The target HADS are (i) XX Cygni, (ii) YZ Bootis, (iii) GP Andromedae, and (iv) ZZ Microscopii. The newly determined times of maximum light came from the Transiting Exoplanet Survey Satellite (TESS), American Association of Variable Star Observers (AAVSO), and Bundesdeutsche Arbeitsgemeinschaft f$\ddot{\mathrm{u}}$r Ver$\ddot{\mathrm{a}}$nderliche Sterne (BAV) projects. Together with the times of maximum light obtained in the historical literature, the $O-C$ analysis was performed on these HADS, in which we obtained the linear period variation rates $\dot{P}/P$ as $(9.2\pm 0.2)\times 10^{-9}\mathrm{y}{\mathrm{r}}^{-1}$, $(3.2\pm 0.2)\times 10^{-9}\mathrm{y}{\mathrm{r}}^{-1}$, $(4.22\pm 0.03)\times 10^{-8}\mathrm{y}{\mathrm{r}}^{-1}$, and $(-2.06\pm 0.02)\times 10^{-8}\mathrm{y}{\mathrm{r}}^{-1}$, respectively. Based on these results and some earlier research, we also discuss the evolutionary stages and the mechanisms of the period variation of these four HADS.

12 pages, 5 figures, 1 table. Universe published

References in corpus (15)

• The Transiting Exoplanet Survey Satellite
• Evolution of LMXBs under Different Magnetic Braking Prescriptions
• Echography of young stars reveals their evolution
• KIC5950759: a high-amplitude $\delta$ Sct star with amplitude and frequency modulation near the terminal age main sequence
• Binarity and multiperiodicity in high-amplitude delta Scuti stars
• Photometry of GSC 762-110, a new triple-mode radially pulsating star
• DY Pegasi: An SX Phoenicis Star in a Binary System with an Evolved Companion
• Asteroseismology of the double-radial mode $\delta$ Scuti star BP Pegasi
• A rapidly evolving high-amplitude $\delta$ Scuti star crossing the Hertzsprung Gap
• Modeling of multimode radially pulsating High-Amplitude Delta Scuti stars from the OGLE Galactic bulge sample
• Pulsation Analysis of High-Amplitude $\delta$ Scuti Stars with TESS
• Precise Evolutionary Asteroseismology of High-Amplitude δ Scuti Star AE Ursae Majoris
• Pulsations of the SX Phe Star BL Camelopardalis
• Searching for $\delta$ Scuti-type pulsation and characterising northern pre-main-sequence field stars
• Pulsations and Period Variations of the $\delta$ Scuti Star AN Lyncis in a possible three-body system