626 citations · 4.9k across the 107 of their papers we have counts for
19 papers · 1 filter
A spectroscopically confirmed Gaia-selected sample of 318 new young stars within 200 pc
Maruša Žerjal, Adam D. Rains, Michael J. Ireland +7
In the Gaia era, the majority of stars in the Solar neighbourhood have parallaxes and proper motions precisely determined while spectroscopic age indicators are still missing for a…
The GALAH+ Survey: A New Library of Observed Stellar Spectra Improves Radial Velocities and Hints at Motions within M67
Tomaž Zwitter, Janez Kos, Sven Buder +25
GALAH+ is a magnitude-limited survey of high resolution stellar spectra obtained by the HERMES spectrograph at the Australian Astronomical Observatory. Its third data release provi…
The GALAH Survey: Chemical Clocks
Michael R. Hayden, Sanjib Sharma, Joss Bland-Hawthorn +27
Previous studies have found that the elemental abundances of a star correlate directly with its age and metallicity. Using this knowledge, we derive ages for a sample of 250,000 st…
Milky Way Tomography with the SkyMapper Southern Survey. II. Photometric Re-calibration of SMSS DR2
Yang Huang, Haibo Yuan, Chengyuan Li +13
We apply the spectroscopy-based stellar-color regression (SCR) method to perform an accurate photometric re-calibration of the second data release from the SkyMapper Southern Surve…
Exploring the Galaxy's halo and very metal-weak thick disk with SkyMapper and Gaia DR2
G. Cordoni, G. S. Da Costa, D. Yong +16
In this work we combine spectroscopic information from the \textit{SkyMapper survey for Extremely Metal-Poor stars} and astrometry from Gaia DR2 to investigate the kinematics of a…
Combined APOGEE-GALAH stellar catalogues using the Cannon
Govind Nandakumar, Michael R. Hayden, Sanjib Sharma +21
APOGEE and GALAH are two high resolution multi-object spectroscopic surveys that provide fundamental stellar parameters and multiple elemental abundance estimates for about half a…
The GALAH Survey: Accreted stars also inhabit the Spite Plateau
Jeffrey D. Simpson, Sarah L. Martell, Sven Buder +22
The ESA Gaia astrometric mission has enabled the remarkable discovery that a large fraction of the stars near the Solar neighbourhood appear to be debris from a single in-falling s…
The GALAH survey: tracing the Galactic disk with Open Clusters
Lorenzo Spina, Yuan-Sen Ting, Gayandhi M. De Silva +28
Open clusters are unique tracers of the history of our own Galaxy's disk. According to our membership analysis based on \textit{Gaia} astrometry, out of the 226 potential clusters…
The GALAH survey: effective temperature calibration from the InfraRed Flux Method in the Gaia system
L. Casagrande, J. Lin, A. D. Rains +23
In order to accurately determine stellar properties, knowledge of the effective temperature of stars is vital. We implement Gaia and 2MASS photometry in the InfraRed Flux Method an…
The GALAH+ Survey: Third Data Release
Sven Buder, Sanjib Sharma, Janez Kos +44
The ensemble of chemical element abundance measurements for stars, along with precision distances and orbit properties, provides high-dimensional data to study the evolution of the…
The GALAH survey: Chemical homogeneity of the Orion complex
Janez Kos, Joss Bland-Hawthorn, Sven Buder +17
Due to its proximity, the Orion star forming region is often used as a proxy to study processes related to star formation and to observe young stars in the environment they were bo…
3D NLTE spectral line formation of lithium in late-type stars
E. Wang, T. Nordlander, M. Asplund +3
Accurately known stellar lithium abundances may be used to shed light on a variety of astrophysical phenomena such as Big Bang nucleosynthesis, radial migration, ages of stars and…
The GALAH Survey: Using Galactic Archaeology to Refine our Knowledge of TESS Target Stars
Jake T. Clark, Mathieu Clerte, Natalie R. Hinkel +29
An unprecedented number of exoplanets are being discovered by the Transiting Exoplanet Survey Satellite (TESS). Determining the orbital parameters of these exoplanets, and especial…
A Minimum Dilution Scenario for Supernovae and Consequences for Extremely Metal-Poor Stars
Mattis Magg, Thomas Nordlander, Simon C. O. Glover +6
To date no metal-free stars have been identified by direct observations. The most common method of constraining their properties is searching the spectra of the most metal-poor sta…
Fundamental stellar parameters of benchmark stars from CHARA interferometry. I. Metal-poor stars
I. Karovicova, T. R. White, T. Nordlander +4
Benchmark stars are crucial as validating standards for current as well as future large stellar surveys of the Milky Way. However, the number of suitable metal-poor benchmarks is c…
The GALAH Survey: A new constraint on cosmological lithium and Galactic lithium evolution from warm dwarf stars
Xudong Gao, Karin Lind, Anish M. Amarsi +22
Lithium depletion and enrichment in the cosmos is not yet well understood. To help tighten constraints on stellar and Galactic evolution models, we present the largest high-resolut…
The GALAH survey: Characterization of emission-line stars with spectral modelling using autoencoders
Klemen Čotar, Tomaž Zwitter, Gregor Traven +11
We present a neural network autoencoder structure that is able to extract essential latent spectral features from observed spectra and then reconstruct a spectrum from those featur…
How magnetic activity alters what we learn from stellar spectra
Lorenzo Spina, Thomas Nordlander, Andrew R. Casey +8
Magnetic fields and stellar spots can alter the equivalent widths of absorption lines in stellar spectra, varying during the activity cycle. This also influences the information th…
Fundamental relations for the velocity dispersion of stars in the Milky Way
Sanjib Sharma, Michael R. Hayden, Joss Bland-Hawthorn +34
We explore the fundamental relations governing the radial and vertical velocity dispersions of stars in the Milky Way, from combined studies of complementary surveys including GALA…