Pulsations of the High-Amplitude $\delta$ Scuti Star YZ Bootis

Abstract

We present a study on the pulsations of the high-amplitude $\delta$ Scuti star YZ Boo based on photometric observations in Johnson $V$ and $R$ bands with both the Nanshan 1-m telescope of Xinjiang Astronomical Observatory (XAO) and the Xinglong 85-cm telescope of National Astronomical Observatories, Chinese Academy of Sciences (NAOC). The Fourier analysis of the light curves reveals the fundamental radial mode and its five harmonics, with the fourth and the fifth newly detected. 39 new times of light maximum are determined from the light curves, and combined with those in the literature, we construct the $O-C$ diagram and derive a new ephemeris and the determination of a new value of the updated period 0.104091579(2). Besides, the $O-C$ diagram reveals an increasing period change rate of YZ Boo. Theoretical models are calculated and constrained with the observationally determined parameters of YZ Boo. The mass and age of YZ Boo are hence derived as $M$ = 1.61 $\pm$ 0.05 $M_{\odot }$ and $age$ = (1.44 $\pm$ 0.14) $\times$ 10${}^9$ yr, respectively. With both the frequency of the fundamental radial mode and the period change rate, YZ Boo is located at the post-main-sequence stage.

arXiv comment12 pages, 6figures

References in corpus (4)

• Modules for Experiments in Stellar Astrophysics (MESA)
• ADIPLS -- the Aarhus adiabatic oscillation package
• The radio surface brightness to diameter relation for galactic supernova remnants: sample selection and robust analysis with various fitting offsets
• A photometric monitoring of bright high-amplitude delta Scuti stars. II. Period updates for seven stars

Cited by in corpus (9)

• A Weak Modulation Effect Detected in the Light Curves of KIC 5950759: Intrinsic or Instrumental Effect?
• The Wide-field Photometric System of the Nanshan One-meter Telescope
• Asteroseismology of the Double-Mode High-Amplitude $\delta$ Scuti Star VX Hydrae
• A double-modulation effect detected in a double-mode high-amplitude $\delta$ Scuti star: KIC 10284901
• Frequency analysis of KIC 1573174 : shedding light on the nature of HADS stars
• KIC 12602250: A low-amplitude Double-mode $\delta$ Scuti star with Amplitude Modulation
• KIC 10975348: A double-mode or triple-mode high-amplitude $\delta$ Scuti star?
• New CCD Photometric Investigation of High Amplitude Delta Scuti Star V2455 Cyg
• Period Variation Rates of Four Radial Single-Mode High-Amplitude Delta Scuti Stars