基于TESS观测发现并表征三颗新的高振幅δ Scuti星
Discovery and Characterization of Three New High-amplitude delta Scuti Stars from TESS Observations
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- Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台）
- School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）
- Instituto de Astrofísica de Andalucía - CSIC（安达卢西亚天体物理研究所-西班牙国家研究委员会）
- Ulugh Beg Astronomical Institute, Uzbekistan Academy of Sciences（乌兹别克斯坦科学院乌鲁伯格天文研究所）
- Samarkand State University（撒马尔罕国立大学）
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中文总结 AI 辅助
本研究从TESS短周期观测中发现三颗新的高振幅δ Scuti星，通过傅里叶分析、SED拟合及与MESA和GYRE建模结果对比，揭示其特性与振幅变异性，强调长期监测的重要性。
中文摘要 AI 辅助
我们报告了从凌日系外行星巡天卫星（TESS）短周期观测数据中识别出的三颗新的高振幅δ Scuti（HADS）星的发现及详细分析，它们分别是TIC 408074920、TIC 189714989和TIC 34137913。傅里叶分析显示，这三颗恒星均存在主导径向模式并伴随丰富的谐波结构，证实了它们的HADS分类。此外，TIC 189714989在径向谐波周围呈现出清晰的对称边峰，表明存在振幅和/或相位调制。受盖亚（Gaia）DR3视差约束的宽带光谱能量分布（SED）拟合，提供了恒星有效温度和半径的独立估计值，这些估计值与基于MESA和GYRE的恒星演化及地震建模结果进行了比较。对于两个目标，SED推导的半径与地震半径相互一致，而TIC 408074920则显示出显著差异，这可能归因于两种方法的不同灵敏度及额外的系统效应。这些发现凸显了经典HADS中振幅变异性的多样性，并强调了未来如PLATO等任务将允许的长期监测对于探索这种变异性的潜在物理机制的重要性。
英文摘要
We report the discovery and detailed analysis of three new high-amplitude δ Scuti (HADS) stars, TIC 408074920, TIC 189714989, and TIC 34137913, identified from Transiting Exoplanet Survey Satellite short-cadence observations. Fourier analysis reveals dominant radial modes accompanied by rich harmonic structures in all three stars, confirming their HADS classification. In addition, TIC 189714989 exhibits clear symmetric side peaks around the radial harmonics, indicative of amplitude and/or phase modulation. Broadband spectral energy distribution (SED) fitting constrained by Gaia DR3 parallaxes provides independent estimates of the stellar effective temperatures and radii. These are compared with results from stellar evolutionary and seismic modeling based on MESA and GYRE. For two targets, the SED-derived and seismic radii are mutually consistent, while TIC 408074920 displays a significant discrepancy, plausibly attributable to the different sensitivities of the two methods and additional systematic effects. These findings highlight the diversity of amplitude variability among classical HADS and emphasize the importance of the long-term monitoring that future missions such as PLATO will allow in order to explore the underlying physical mechanisms of this variability.
