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Very deep spectroscopy of the bright Saturn Nebula NGC 7009 - II. Analysis of the rich optical recombination spectrum
Xuan Fang, Xiao-Wei Liu
[Abridged] We present a critical analysis of the rich optical recombination spectrum of NGC 7009, in the context of the bi-abundance nebular model proposed by Liu et al. (2000). Th…
Plasma Diagnostics for Planetary Nebulae and H II Regions Using the N II and O II Optical Recombination Lines
Ian A. McNabb, Xuan Fang, Xiaowei Liu +2
We carry out plasma diagnostic analyses for 123 planetary nebulae (PNe) and 42 H II regions using the N II and O II optical recombination lines (ORLs). New effective recombination…
Atmospheric Extinction Coefficients and Night Sky Brightness At the Xuyi Observational Station
H. -H Zhang, X. -W. Liu, H. -B. Yuan +4
We present measurements of the optical broadband atmospheric extinction coefficients and the night sky brightness at the Xuyi Observational Station of Purple Mountain Observatory (…
Extremely Metal-Poor Star Candidates in the SDSS
Siyao Xu, Huawei Zhang, Xiaowei Liu
For a sample of metal-poor stars (-3.3< [Fe/H] <-2.2) that have high-resolution spectroscopic abundance determinations, we have measured equivalent widths (EW) of the Ca II K, Mg I…
Detections of Diffuse Interstellar Bands in the SDSS Low-resolution Spectra
Haibo Yuan, Xiaowei Liu
Diffuse interstellar bands (DIBs) have been discovered for almost a century, but their nature remains one of the most challenging problems in astronomical spectroscopy. Most recent…
LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) The survey science plan
Licai Deng, Heidi Jo Newberg, Chao Liu +22
We describe the current plans for a spectroscopic survey of millions of stars in the Milky Way galaxy using the Guo Shou Jing Telescope (GSJT, formerly the Large Area Multi-Object…