2404017

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）：251.276459 度
目标赤纬（J2000）：33.50923 度
盖亚（Gaia）G星等：7.48
项目编号：CH_PR240019
观测项目首席研究员：Stalport
项目标题：通过结合绝对测光与高强度视向速度（radial velocity, RV）监测解析恒星活动模式
摘要：现如今，恒星活动是探测视向速度（RV）振幅处于亚米每秒级行星的主要障碍。在不久的将来，PLATO任务将对天空特定区域内亮星的光度变化开展高精度巡天。将此类观测数据与最高精度光谱仪的观测结果相结合，无疑将为缓解恒星活动的影响提供关键途径，并有望实现米每秒级以下的质量测量，以达成PLATO任务的科学目标。CHEOPS为提前布局PLATO任务、有力支撑大规模视向速度巡天提供了独特契机。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形成并行观测。作为一项约束条件极为有限的补充项目，此类观测将有助于解析复杂的恒星视向速度活动信号，并可作为CHEOPS长期稳定性与高精度绝对测光能力的基准测试案例。
【文本已截断！如需完整内容请查阅原始数据】