Roquette Julia, Bouvier Jerome, Moraux Estelle, Bouy Herve, Irwin Jonathan, Aigrain Suzanne, Lachaume Régis
Department of Physics and Astronomy, University of Exeter Physics Building, Stocker Road, Exeter, EX4 4QL, United Kingdom.
Univ. Grenoble Alpes, CNRS IPAG, F-38000 Grenoble, France.
Proc Int Astron Union. 2019 Jun;15(Suppl 354):200-203. doi: 10.1017/S1743921319009797. Epub 2020 Sep 24.
Together with the stellar rotation, the spotted surfaces of low-mass magnetically active stars produce modulations in their brightness. These modulations can be resolved by photometric variability surveys, allowing direct measurements of stellar spin rates. In this pro-ceedings, we present results of a multisite photometric survey dedicated to the measurement of spin rates in the 30 Myr cluster NGC 3766. Inside the framework of the Monitor Project, the cluster was monitored during 2014 in the i-band by the Wide Field Imager at the MPG/ESO 2.2-m telescope. Data from Gaia-DR2 and Y photometry from DECam/CTIO were used to identify cluster members. We present spin rates measured for ∼200 cluster members.
低质量磁活动恒星的斑点表面与恒星自转一起，会导致其亮度产生调制。这些调制可以通过光度变化测量来解析，从而直接测量恒星的自转速率。在本次会议论文集中，我们展示了一项多站点光度测量的结果，该测量致力于测定3000万年前形成的NGC 3766星团中恒星的自转速率。在监测项目的框架内，2014年使用位于MPG/ESO 2.2米望远镜上的广域成像仪在i波段对该星团进行了监测。利用盖亚 - DR2数据和来自暗能量相机（DECam）/托洛洛山美洲际天文台（CTIO）的Y波段光度测量数据来识别星团成员。我们展示了对约200颗星团成员测量得到的自转速率。
