LAMOST光谱巡天第九次数据发布第〇版

LAMOST光谱巡天第九次数据发布第〇版包括2020年9月18日至2021年6月14日期间获得的低分辨率和中分辨率光谱巡天两部分数据。其中低分辨率巡天共观测326个天区，发布低分辨率光谱539,137条，其中恒星光谱492,068条（g或i波段信噪比大于10的光谱468,703条），星系光谱15,801条，类星体光谱3582条，未知类型光谱27,686条，AFGK型恒星参数信息350,716条。中分辨率巡天共观测440个天区，发布单次曝光光谱6,054,085条（信噪比大于10光谱2,846,395条），合并光谱1,724,868条（信噪比大于10光谱1,050,637条），合并光谱恒星参数信息446,907条。

The 0th version of the 9th Data Release of the LAMOST Spectroscopic Survey includes two parts of data: low-resolution and medium-resolution spectroscopic survey data acquired between September 18, 2020 and June 14, 2021.
For the low-resolution spectroscopic survey, a total of 326 sky fields were observed, and 539,137 low-resolution spectra were released, including 492,068 stellar spectra (468,703 of which have a signal-to-noise ratio (SNR) greater than 10 in the g or i band), 15,801 galaxy spectra, 3,582 quasar spectra, 27,686 spectra of unknown types, and 350,716 sets of stellar parameter information for AFGK-type stars.
For the medium-resolution spectroscopic survey, a total of 440 sky fields were observed, with 6,054,085 single-exposure spectra (2,846,395 of which have SNR greater than 10) and 1,724,868 co-added spectra (1,050,637 of which have SNR greater than 10) released, along with 446,907 sets of stellar parameter information derived from the co-added spectra.