发表机构
Xinjiang Astronomical Observatory, Chinese Academy of Sciences; School of Astronomy and Space Science, University of Chinese Academy of Sciences; Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick; Institute of Geophysics, University of Tehran; Department of Physics, Faculty of Science, University of Qom; Instituto de Astrofísica de Andalucía - CSIC; Departamento de Física Teórica y del Cosmos, Universidad de Granada; Ulugh Beg Astronomical Institute, Uzbekistan Academy of Sciences（中国科学院新疆天文台; 中国科学院大学天文学与空间科学学院; 华威大学物理学院聚变、太空与天体物理学中心; 德黑兰大学地球物理学研究所; 库姆大学理学院物理系; 安达卢西亚天体物理研究所-西班牙国家科研委员会; 格拉纳达大学理论与宇宙物理学系; 乌兹别克斯坦科学院乌鲁格别克天文研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究分析TESS第4周期观测的δ Scuti星，识别765颗目标，结合LAMOST数据研究其参数分布，估算星震指数并推导其关系，构建的星表可用于δ Scuti星内部结构与演化研究。
AI 中文摘要
我们分析了TESS第4周期观测的δ Scuti星的统计特性与星震指数。利用2分钟 cadence测光数据与傅里叶分析，我们在Sectors 40-55中识别出765颗δ Scuti星，其中包括179颗拥有LAMOST低分辨率恒星参数的天体。我们结合TESS输入星表与LAMOST数据，研究了它们的脉动参数与恒星参数的分布。大部分目标位于经典不稳定带内，遵循周光关系，且周期、振幅、温度、表面重力加速度与光度均符合δ Scuti星的特征。针对LAMOST子样本，我们采用经验关系与二维自相关法估算了大频率间隔（Δν）、ν_max与ν(Amax)，还推导了这些星震指数之间的关系。该星表为后续δ Scuti星的内部结构与演化研究提供了有用样本。
英文摘要
We analyze the statistical properties and asteroseismic indices of delta Scuti stars observed during TESS Cycle 4. Using 2 minute cadence photometry and Fourier analysis, we identified 765 delta Scuti stars in Sectors 40-55, including 179 objects with low-resolution stellar parameters from LAMOST. We examined the distributions of their pulsation and stellar parameters using values from the TESS Input Catalog and LAMOST. Most targets lie within the classical instability strip, follow the period-luminosity relation, and show periods, amplitudes, temperatures, surface gravities, and luminosities consistent with delta Scuti stars. For the LAMOST subsample, we estimated the large frequency separation ($Δν$), $ν_{\rm max}$, and $ν({\rm Amax})$ using an empirical relation and a two-dimensional autocorrelation method. We also derived relations among these asteroseismic indices. This catalog provides a useful sample for future studies of the internal structure and evolution of delta Scuti stars.
Comments17 pages, 18 figures, 3 tables. Published in Astronomy & Astrophysics
Journal refAstronomy & Astrophysics, 686, A174 (2024)
DOI：10.1051/0004-6361/202346985
