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arXiv 2603.02421astro-ph.SR
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天琴座α变星从凌星系外行星巡天卫星的观测

Alpha Cygni Variables as Seen from the Transiting Exoplanet Survey Satellite

Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室);University of New Mexico(新墨西哥大学);New Mexico Institute of Mining and Technology(新墨西哥矿业与技术学院);New Mexico State University(新墨西哥州立大学)

Joyce A. Guzik, Claire Whitley, Nova Moore, Madeline Marshall, Jason Jackiewicz

AI总结:

研究利用TESS观测分析75个ACYG变星,识别出10颗可能适合地面监测的候选星,并探讨其在赫罗图上的位置及不同数据处理管道的适用性。

摘要:

天琴座α变星(ACYG)是蓝色白色超巨星,表现出约0.1等幅度的低振幅亮度变化。原型星天津四显示出约12天的准周期性变化,被中断的不规则变化间隔,偶尔有较大的振幅波动。为了了解这些变星的行为,我们检查了27天的光变曲线,来自凌星系外行星巡天卫星(TESS)的75个位于黄道面南侧的ACYG变星,这些变星将在2025-2026年再次被TESS观测。我们使用基于网络的TESS Extractor应用程序对TESS光变曲线进行筛选。我们识别出10颗与天津四相似的恒星,可能是地面监测的良好候选者。我们近似确定这些恒星在赫罗图上的位置,并发现大多数位于明亮蓝变量之下,比β天琴座变星更冷,比室女座RV变星更热。我们还比较了使用不同处理管道处理的光变曲线,这些管道在米库尔斯基空间望远镜档案(MAST)上可用,并评论了它们对ACYG恒星的适用性。

英文摘要:

The Alpha Cygni (ACYG) variables are blue-white supergiants which display low-amplitude brightness variations of around 0.1 magnitude. The prototype Deneb shows quasi-periodic variations of around 12 days, interrupted by intervals of erratic variability, and occasionally large excursions in amplitude. To gain insight on the behavior of these variables, we examined 27-day light curves from the Transiting Exoplanet Survey Satellite (TESS) for 75 ACYG variables south of the ecliptic plane which are being revisited by TESS in 2025-2026. We use the web-based TESS Extractor app for screening TESS light curves. We identified ten stars with similarities to Deneb that may be good candidates for ground-based monitoring. We approximated the location of these stars on the Hertzsprung-Russell diagram, and find most lie below the Luminous Blue Variables, are cooler than the beta Cephei variables, and are hotter than the RV Tauri stars. We also compare light curves processed with several different pipelines available on the Mikulski Archive for Space Telescopes (MAST) and comment on their utility for ACYG stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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