2423216

Target RA (J2000): 251.276459 and deg Target Dec (J2000): 33.50923 and deg Gaia GMag: 7.48 Programme ID: CH_PR240019 PI of observing programme: Stalport Title of programme: Understanding stellar activity patterns by coupling absolute photometry and intense RV monitoring Abstract: Nowadays stellar activity constitutes the main obstacle to the detection of planets with sub-meter per second radial velocity (RV) amplitudes. In the near future the PLATO mission will survey with high precision the photometric variations of bright stars inxa0specific areas of the sky. The combination of those observations with the most precise spectrographs will certainly be of upmost interest to alleviate stellar activity effects and provide mass measurements below the meter per second level needed to reach PLATO’s science goals. CHEOPS represents a unique opportunity to take a step ahead in prevision of PLATO and valuably support extensive RV surveys. We propose a long-term absolute photometry campaign in parallel to an already secured intense RV monitoring on HD151288 a moderately active star with yet-unclear activity patterns. In the fashion of a filler program with very limited constraints those observations could shed light on the complex RV stellar activity signals and they would serve as a benchmark for CHEOPS long-term stability and ability to conduct precise absolute photometry. [truncated! Please see actual data for full text]

目标赤经（J2000坐标系）：251.276459 度，目标赤纬（J2000坐标系）：33.50923 度，盖亚G星等（Gaia GMag）：7.48，项目编号：CH_PR240019，观测项目首席研究员：Stalport，项目标题：通过绝对测光与视向速度（RV，Radial Velocity）监测联用解析恒星活动模式
摘要：现如今，恒星活动是探测视向速度振幅低于每秒亚米级行星的主要阻碍。不久的将来，PLATO任务将对特定天区的亮星开展高精度测光变化巡天。将此类观测与当前最高精度的光谱仪相结合，无疑将为缓解恒星活动的影响提供关键支撑，并可实现每秒米级以下的质量测量，以达成PLATO的科学目标。系外行星表征卫星（CHEOPS，Characterizing ExOPlanets Satellite）为PLATO任务提前布局、为大规模RV巡天提供宝贵支持创造了独特契机。我们提议针对HD 151288——一颗活动程度中等、活动模式尚未明确的恒星——开展一项长期绝对测光观测计划，与已获批的高强度视向速度监测项目并行推进。作为一项约束条件极为宽松的补充观测项目，本次观测可助力解析复杂的恒星视向速度活动信号，同时可为CHEOPS的长期稳定性及高精度绝对测光能力提供性能基准。
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