Pre-study of LAMOST-Kepler/K2 project based on improvements in astronomical site conditions
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摘要: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%．
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关键词:
- LAMOST巡天/
- LAMOST-Kepler项目/
- 天文台址观测条件
Abstract: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． -
表 1K2各campaign观测目标数与LAMOST LRS9共同源数
campaign 观测目标数 LAMOST K2数 C0 7 748 6 373 C1 21 646 13 053 C2 13 401 0 C3 16 375 162 C4 15 781 11 712 C5 25 137 17 811 C6 28 289 2 569 C7 13 261 0 C8 23 565 13 618 C9 1 247 0 C10 27 170 10 019 C11 13 607 0 C12 28 088 1 765 C13 21 367 14 896 C14 29 897 12 267 C15 23 278 0 C16 29 413 16 189 C17 32 221 5 049 C18 20 427 14 806 C19 33 861 4 227 合计 425 779 144516 
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表 2Kepler天区（14个LK field）目标数及台址条件提升后所需plate数的预测
LK field 目标数 所需plate数 LK01 16 262 2 LK02 30 643 3 LK03 26 291 3 LK04 30 313 3 LK05 24 832 3 LK06 29 446 3 LK07 28 495 3 LK08 15 558 2 LK09 20 487 2 LK10 23 973 3 LK11 15 472 2 LK12 13 419 2 LK13 11 711 2 LK14 15 610 2 合计 302 512 35 下载:
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