LAMOST反银心方向光谱巡天恒星大气参数的测量及增值星表的构建

To make best usage of the huge stellar spectra currently being collected by the LAMOST for the studies of the structure, kinematics and chemistry of the Galactic stellar populations, we propose to further develop LSP3 - the LAMOST Stellar Parameters Pipeline at Peking University, a pipeline based on template matching with the MILES empirical stellar spectral library, to improve the accuracy of parameters already provided, provide additional key parameters and construct and publish value-added catalogs. This includes: 1) Via new observations with the NAOC 2.16m and YNAO 2.4m telescopes, expand the coverage and improve the homogeneity of parameters of the MILES template spectra, as well as their wavelength coverage, thus allowing us to improve the accuracy of parameters yielded by the LSP3 and to increase the number of stars with determined parameters;2) Improve the parameter determination algorithms of LSP3, develop new algorithms for additional parameter determinations, including [α/Fe] and [C/Fe], key for the study of the chemical evolution of the Milky Way; 3) Develop algorithms for dealing with peculiar spectra in order to maximize the discovery space of the LAMOST surveys; 4) Construct and publish value-added catalogs and study the selection effects. The project will lead to the largest and most complete legacy stellar parameter catalogs containing information in multi-phase space for usage by national and international researchers.

本项目拟进一步改进和完善申请人团组开发的基于MILES恒星光谱库模板匹配分析方法的LAMOST银河系光谱巡天恒星基本参数测量流水线LSP3，并结合其它星表构建和发布增值星表，为利用LAMOST海量光谱数据研究银河系星族结构及其化学动力学性质奠定坚实基础。包括：1）利用国台2.16米和云台2.4米望远镜开展观测以扩展MILES模板库参数覆盖范围、均匀性及光谱波长覆盖范围，对模板星大气参数进行重整，提高LSP3参数测量精度并增加可测源数；2）升级和完善LSP3算法，增加对银河系化学演化研究有重要意义的[α/Fe]和[C/Fe]参数的测量；3）增加特殊光谱的处理能力，最大限度挖掘LAMOST光谱巡天的潜力；4）构建和发布包含多维相空间信息的增值星表、特色样本，研究样本的选择效应。项目实施将产生LAMOST标志性的、国际上规模最大、参数种类最齐全的高精度银河系恒星参数库，供国内外同行研究使用。

智能、高效、准确地获取恒星基本物理参量是基于LAMOST获取的海量恒星光谱数据开展银河系结构、性质、形成和演化研究的基础和前提。为更好地利用LAMOST获取的海量光谱数据来研究银河系的星族构成、空间分布及其化学动力学性质，项目组进一步改进和完善了项目组之前开发的基于MILES恒星光谱库模板匹配分析方法的LAMOST银河系光谱巡天恒星基本参数测量软件包LSP3；结合其它星表构建和发布了第二版增值星表，即将发布最终版增值星表；基于增值星表在银河系结构和化学运动学研究等领域取得了系列成果。包括：1) 扩展了MILES模板库参数覆盖范围、均匀性及光谱波长覆盖范围，升级并完善了LSP3算法，提高了LSP3参数测量精度和可测参数种类；2）构建和发布了包含多维相空间信息的LAMOST反银心方向光谱巡天增值星表与各类特色样本；3) 基于增值星表证认、研究了银河系各类特殊天体，开展了系列银盘星族、结构和化学运动学研究。项目提供了包含恒星数目最大、参数种类最齐全、测量精度最高的增值星表供全世界感兴趣的天文学家使用，促进了LAMOST巡天的科学能力和产出以及国际影响力。