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Not all stars form in clusters -- -DR2 uncovers the origin of OB associations
Jacob L. Ward, J. M. Diederik Kruijssen, Hans-Walter Rix
Historically, it has often been asserted that most stars form in compact clusters. In this scenario, present-day gravitationally-unbound OB associations are the result of the expan…
Abundance Estimates for 16 Elements in 6 Million Stars from LAMOST DR5 Low-Resolution Spectra
Maosheng Xiang, Yuan-Sen Ting, Hans-Walter Rix +6
We present the determination of stellar parameters and individual elemental abundances for 6 million stars from 8 million low-resolution () spectra from LAMOST DR5…
In the Galactic disk, stellar [Fe/H] and age predict orbits and precise [X/Fe]
Melissa K. Ness, Kathryn V. Johnston, Kirsten Blancato +4
We explore the structure of the element abundance--age--orbit distribution of the stars in the Milky Way's low- disk, by (re-)deriving precise [Fe/H], [X/Fe] and ages, along wit…
NLTE Chemical abundances in Galactic open and globular clusters
Mikhail Kovalev, Maria Bergemann, Yuan-Sen Ting +1
Aims We study the effects of non-local thermodynamic equilibrium (NLTE) on the determination of stellar parameters and abundances of Fe, Mg, and Ti from the medium-resolution spect…
Discovery of an equal-mass "twin" binary population reaching 1000+ AU separations
Kareem El-Badry, Hans-Walter Rix, Haijun Tian +2
We use a homogeneous catalog of 42,000 main-sequence wide binaries identified by Gaia to measure the mass ratio distribution, p(q), of binaries with primary masses $0.1<M_1/M_{\odo…
Astro2020 Science White Paper: gravity-wave asteroseismology of intermediate- and high-mass stars
Andrew Tkachenko, Conny Aerts, Dominic M. Bowman +17
The evolution of a star is driven by the physical processes in its interior making the theory of stellar structure and evolution the most crucial ingredient for not only stellar ev…