The paper will present extensive grids of non-LTE departure coefficients for ~13 different elements, the first paper of its kind. These grids were used for GALAH DR3. The results of the paper will however be based on a separate, line-by-line re-analysis of a subset of GALAH DR3 (~50000 stars), in LTE and in non-LTE. This will demonstrate the importance of taking departures from LTE into account in spectroscopic studies, when it comes to studying the mean Galactic chemical evolution and its dispersion.

Paper PDF: 

paper.pdf

Symbiotic binaries (SyB) are composed by a red giant (RG) and a degenerate companion, normally a white dwarf (WD) and in a very few cases a neutron star. In most SyB the WD burns steadily at the surface (Teff ~ 10^5 K and L ~ 10^4 Lsun), ionizing the wind from the RG and giving rise to a rich
emission line spectrum. While the burning phase last for 10^2 - 10^3 yrs, the switch-off period during which the WD refuels by accreting from the RG companion lasts for much longer, with a population proportion
SyB-quiet/SyB-loud >> 1.

Paper PDF: 

paper_Munari.pdf

Peculiar spectra and objects to which they belong are relatively abundant among targets of general all-sky surveys such as GALAH. Detection of such objects is important because the automatic evaluation of their stellar and chemical properties might turn out to be very challenging and therefore introduces a complication in achieving scientific goals such as galactic archaeology.

Paper PDF: 

tSNE_paper_team_review.pdf