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A Unified Model for Bipolar Outflows from Young Stars: Kinematic Signatures of Jets, Winds, and Their Magnetic Interplay with the Ambient Toroids
Hsien Shang, Chun-Fan Liu, Ruben Krasnopolsky +1
Kinematic signatures of the jet, winds, multicavities, and episodic shells arising in the unified model of bipolar outflows developed in Shang et al.\ (2020), in which an outflow f…
A White Dwarf-Main Sequence Binary Unveiled by Time-Domain Observations from LAMOST and TESS
Ling-Lin Zheng, Wei-Min Gu, Mouyuan Sun +16
We report a single-lined white dwarf-main sequence binary system, LAMOST J172900.17+652952.8, which is discovered by LAMOST's medium resolution time-domain surveys. The radial velo…
Ejection History of the IRAS 04166+2706 Molecular Jet
Liang-Yao Wang, Hsien Shang, Tzu-Yang Chiang
The high-velocity molecular jet driven by Class 0 protostar IRAS 04166+2706 exhibits a unique saw-tooth velocity pattern. It consists of a series of well-aligned symmetric knots wi…
The Pan-Pacific Planet Search V. Fundamental Parameters for 164 Evolved Stars
Robert A. Wittenmyer, Fan Liu, Liang Wang +3
We present spectroscopic stellar parameters for the complete target list of 164 evolved stars from the Pan-Pacific Planet Search, a five-year radial velocity campaign using the 3.9…
Calibration of LAMOST Stellar Surface Gravities Using the Kepler Asteroseismic Data
Liang Wang, Wei Wang, Yue Wu +7
Asteroseismology is a powerful tool to precisely determine the evolutionary status and fundamental properties of stars. With the unprecedented precision and nearly continuous photo…
A Two-Temperature Model of Magnetized Protostellar Outflows
Liang-Yao Wang, Hsien Shang, Ruben Krasnopolsky +1
We explore kinematics and morphologies of molecular outflows driven by young protostars using magnetohydrodynamic simulations in the context of the unified wind model of Shang et a…
Palladium and silver abundances in stars with [Fe/H] > -2.6
Xiaoshu Wu, Liang Wang, Jianrong Shi +2
Palladium (Pd) and silver (Ag) are the key elements for probing the weak component in the rapid neutron-capture process (r-process) of stellar nucleosynthesis. We performed a detai…
Spectroscopic analysis of metal-poor stars from LAMOST: early results
Hai-Ning Li, Gang Zhao, Norbert Christlieb +5
We report on early results from a pilot program searching for metal-poor stars with LAMOST and follow-up high-resolution observation acquired with the MIKE spectrograph attached to…
Molecular Jet of IRAS 04166+2706
Liang-Yao Wang, Hsien Shang, Yu-Nung Su +5
The molecular outflow from IRAS 04166+2706 was mapped with the Submillimeter Array (SMA) at 350 GHz continuum and CO J = 32 at an angular resolution of ~1 arcsec. The field of v…