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The Galah Survey: Classification and diagnostics with t-SNE reduction of spectral information
G. Traven, G. Matijevič, T. Zwitter +24
Galah is an ongoing high-resolution spectroscopic survey with the goal of disentangling the formation history of the Milky Way, using the fossil remnants of disrupted star formatio…
Masses and Ages for 230,000 LAMOST Giants, via Their Carbon and Nitrogen Abundances
Anna Y. Q. Ho, Hans-Walter Rix, Melissa K. Ness +3
We measure carbon and nitrogen abundances to 0.1 dex for 450,000 giant stars from their low-resolution (R1800) LAMOST DR2 survey spectra. We use these [C/M] and [N…
Delayed triggering of radio Active Galactic Nuclei in gas-rich minor mergers in the local Universe
Stanislav Shabala, Adam Deller, Sugata Kaviraj +5
We examine the processes triggering star formation and Active Galactic Nucleus (AGN) activity in a sample of 25 low redshift () gas-rich galaxy mergers observed at milli-ar…
Constructing Polynomial Spectral Models for Stars
Hans-Walter Rix, Yuan-Sen Ting, Charlie Conroy +1
Stellar spectra depend on the stellar parameters and on dozens of photospheric elemental abundances. Simultaneous fitting of these model labels to observed…
Accelerated Fitting of Stellar Spectra
Yuan-Sen Ting, Charlie Conroy, Hans-Walter Rix
Stellar spectra are often modeled and fit by interpolating within a rectilinear grid of synthetic spectra to derive the stars' labels: stellar parameters and elemental abundances.…