77 citations · 216 across the 13 of their papers we have counts for
13 papers
The Prevalence of the -bimodality: First JWST -abundance Results in M31
David L. Nidever, Karoline Gilbert, Erik Tollerud +8
We present initial results from our JWST NIRSpec program to study the -abundances in the M31 disk. The Milky Way has two chemically-defined disks, the low- and high- disks…
Disentangling Stellar Age Estimates from Galactic Chemodynamical Evolution
Jeff Shen, Joshua S. Speagle, J. Ted Mackereth +2
Stellar ages are key for determining the formation history of the Milky Way, but are difficult to measure precisely. Furthermore, methods that use chemical abundances to infer ages…
Spatial metallicity variations of mono-temperature stellar populations revealed by early-type stars in LAMOST
Chun Wang, Haibo Yuan, Maosheng Xiang +3
We investigate the radial metallicity gradients and azimuthal metallicity distributions on the Galactocentric -- plane using mono-temperature stellar populations selected fro…
Ba-enhanced dwarf and subgiant stars in the LAMOST Galactic surveys
Meng Zhang, Maosheng Xiang, Hua-Wei Zhang +3
Ba-enhanced stars are interesting probes of stellar astrophysics and Galactic formation history. In this work, we investigate the chemistry and kinematics for a large sample of Ba-…
The Stellar Halo of the Galaxy is Tilted & Doubly Broken
Jiwon Jesse Han, Charlie Conroy, Benjamin D. Johnson +7
Modern Galactic surveys have revealed an ancient merger that dominates the stellar halo of our Galaxy (\textit{Gaia}-Sausage-Enceladus, GSE). Using chemical abundances and kinemati…
An Unsupervised Learning Approach for Quasar Continuum Prediction
Zechang Sun, Yuan-Sen Ting, Zheng Cai
Modeling quasar spectra is a fundamental task in astrophysics as quasars are the tell-tale sign of cosmic evolution. We introduce a novel unsupervised learning algorithm, Quasar Fa…