Pulsations of the High-Amplitude<i>δ</i>Scuti star YZ Bootis

Yang, Tao-Zhi; Esamdin, Ali; Fu, Jian-Ning; Niu, Hubiao; Feng, Guojie; Song, Fengfei; Liu, Jinzhong; Ma, Lihua

doi:10.1088/1674-4527/18/1/2

Cited by 14 publications

(12 citation statements)

References 28 publications

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“…As one may note, five HADS stars have been studied with the stellar masses and evolutionary stages determined by asteroseismology in our series publications. According to Yang et al (2012), Niu et al (2017), Li et al (2018), Yang et al (2018) and this work, we plot the positions of the five stars on the H−R diagram in Figure 9. The observation-determined fundamental frequencies, the period change rates, and the physical parameters from the best-fit models are listed in Table 12.…”

Section: Discussionmentioning

confidence: 94%

Asteroseismology of the Double-mode High-amplitude δ Scuti Star VX Hydrae

Xue

Fox-Machado

et al. 2018

ApJ

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Bi-site time-series photometric and high-resolution spectroscopic observations were made for the double-mode high-amplitude δ Scuti star VX Hya. The fundamental frequency f 0 = 4.4763 c days −1 , the first overtone f 1 = 5.7897 c days −1 and 23 harmonics and linear combinations of f 0 and f 1 are detected by pulsation analysis. From the spectroscopic data, we get [Fe/H] = −0.2 ± 0.1 dex. The period change rate of the fundamental mode is obtained by using the Fourier-phase diagram method, which gives the value of (1/P 0 )(dP 0 /dt) = (1.81 ± 0.09) × 10 −7 yr −1 . With these results from the observations, we perform theoretical explorations with the stellar evolution code MESA, and constrain the models by fitting f 0 , f 1 , and (1/P 0 )(dP 0 /dt) within 3σ deviations. The results show that the period change of VX Hya could be ascribed to the evolutionary effect. The stellar parameters of VX Hya could be derived as: the mass 2.385 ± 0.025 M , the luminosity log(L/L ) = 1.93 ± 0.02 and the age (4.43 ± 0.13) × 10 8 years. VX Hya is found to locate at the post-main-sequence stage with a helium core and a hydrogen-burning shell on the H−R diagram.

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Section: Discussionmentioning

confidence: 94%

Asteroseismology of the Double-mode High-amplitude δ Scuti Star VX Hydrae

Xue

Fox-Machado

et al. 2018

ApJ

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“…To compare with the previously discovered HADS studied with the stellar masses and evolutionary stages determined by asteroseismology, we selected five HADS (e.g., X.H. Yang et al 2012;T.-Z. Yang et al 2018;Niu et al 2017;Xue et al 2018) and plotted these positions along with the KIC 1573174 on the H-R diagram in Figure 7.…”

Section: Tablementioning

confidence: 99%

“…They are traditionally found to be slow rotators with v sin i < 30 km s −1 and pulsation periods between 1 and 6 hr (McNamara 2000). From the ground-based observations, HADS typically have only one or two radial pulsation modes in the fundamental and/or first overtone mode (e.g., X. H. Yang et al 2012;T.-Z. Yang et al, 2018;Niu et al 2017;Xue et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Frequency Analysis of KIC 1573174: Shedding Light on the Nature of HADS Stars

Esamdin

Pascual-Granado

et al. 2022

ApJ

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We propose that KIC 1573174 is a quadruple-mode δ Scuti star with pulsation amplitudes between those of the high-amplitude Delta Scuti star group and average low-amplitude pulsators. The radial modes detected in this star provide a unique opportunity to exploit asteroseismic techniques up to their limits. Detailed frequency analysis is given for the light curve from the Kepler mission. The variation of the light curve is dominated by the strongest mode with a frequency of F0 = 7.3975 day−1, as shown by Fourier analysis of long cadence data (Q1–Q17, spanning 1460 days), indicating that the target is a δ Scuti star. The other three independent modes with F1 = 9.4397 day−1, F2 = 12.1225 day−1, and F3 = 14.3577 day−1, have ratios of P 1/P 0, P 2/P 0, and P 3/P 0 estimated as 0.783, 0.610, and 0.515, which indicate that KIC 1573174 is a quadruple-mode δ Scuti star. A different approach has been used to determine the O − C through the study of phase modulation. The change of period (1/P)dP/dt is obtained resulting in −1.14 × 10−6 yr−1 and −4.48 × 10−6 yr−1 for F0 and F1 respectively. Based on frequency parameters (i.e., F0, F1, F2, and F3), a series of theoretical models were conducted by employing the stellar evolution code MESA. The ratio of observed f 1/f 2 is larger than that of the model, which may be caused by the rotation of the star. We suggest high-resolution spectral observation is highly desired in the future to further constrain models.

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“…According to the needs of different data reduction, the corresponding pipeline has been completed. The main scientific projects conducted using NOWT after the installation have been multi-color photometry of binaries (Zhang et al 2018), pulsating stars (Fu et al 2017), exoplanet (Wang et al 2017), variable stars (Yang et al 2018, Bai et al 2019, gravitational wave ( Liu & Zhang 2014), galaxies (Zhang et al 2015), survey (Ma et al 2018, Zheng et al 2019.…”

Section: Introductionmentioning

confidence: 99%

The Wide-field Photometric System of the Nanshan One-meter Telescope

Bai,

Feng,

Zhang

et al. 2020

Preprint

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The Nanshan One-meter Wide-field Telescope (NOWT) is a prime focus system located at Nanshan Station of Xinjiang Astronomical Observatories (XAO). The field of view(FOV) was designed to 1.5 • × 1.5 • , and Johnson-Cousins UBVRI system was chosen as the main Filter set. The telescope has been providing observation services for astronomers since Sept. 2013. Variable source searching and time-domain surveys are the main scientific goals. The system's test results are reported including linearity, dark current, bias, readout noise and gain of the CCD camera. The accurate instrumental calibration coefficients in UBVRI bands was driven with Landolt standard stars during photometric nights. Finally, the limiting magnitudes are given with signal-to-noise ratios and various exposure times for observers.

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Pulsations of the High-AmplitudeδScuti star YZ Bootis

Cited by 14 publications

References 28 publications

Asteroseismology of the Double-mode High-amplitude δ Scuti Star VX Hydrae

Asteroseismology of the Double-mode High-amplitude δ Scuti Star VX Hydrae

Frequency Analysis of KIC 1573174: Shedding Light on the Nature of HADS Stars

The Wide-field Photometric System of the Nanshan One-meter Telescope

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