基于天文台址条件提升LAMOST-Kepler/K2巡天项目的预研究

为充分利用Kepler空间望远镜2009年4月-2018年10月对约80万颗恒星的超高精度时序测光数据，LAMOST望远镜于2012和2015年分别开启了对Kepler(K1)和K2天区的低分辨率光谱观测，即LK1和LK2巡天项目.在统计了LK1和LK2项目的观测覆盖率之后，就台址条件优化对项目的提升进行了预研究.结果表明：截至2021年6月，LAMOST对K1天区目标星的覆盖率为43%，对K2天区可观测目标星的覆盖率为38%；如能将台址视宁度、天光背景，以及晴夜数这3个方面提升至品质较好的天文台址水平，则LAMOST对K1天区的覆盖率将在2个观测季后达到80%，对K2天区也将在4个观测季后达到70%.

Pre-study of LAMOST-Kepler/K2 project based on improvements in astronomical site conditions

To take full advantage of time-series ultra-high precision photometric data for about 800000 stars obtained during the Kepler space telescope’s mission in 2009-2018, the LAMOST telescope began to carry out low-resolution spectroscopic observations for stars in Kepler (K1) and K2 fields in 2012 and 2015, known as the LK1 and LK2 projects, respectively．After making stastistic analysis on the observed target coverage rates of the LK1 and LK2 projects the improvements of the two projects under better astronomical site conditions were predicted．Until June 2021, LAMOST’s coverage of the K1 sky area has reached 43%, and that of observable targets in the K2 sky area has reached 38%．If the seeing condition, sky background and observable night numbers could be improved at a new site, the coverage of LAMOST observations for K1 targets will reach 80% in two observational seasons, and that for K2 targets will reach 70% after four observational seasons．