Members of the #SAGATeamCAMK are involved in the working group responsible for the exoplanet, stellar, and Galactic science case. The WST project is funded by the European Union under Grant ID 101183153 awarded within the HORIZON-INFRA-2024-DEV-01 call

cordis.europa.eu/project/id/1...

Just a reminder, the Wide-Field Spectroscopic Telescope is a project to build a 12m telescope fully dedicated to multi-object spectroscopy. It will have a large FoV (>3 deg^2) and combine high‐multiplex spectrographs of both low‐ and high‐resolution and a giant panoramic integral field spectrograph

The work was funded by a grant from the Polish National Science Centre (NCN) @ncn.gov.pl

🧑‍🤝‍🧑 We calibrated a similarity metric that can identify stars with parameters that differ by ± 200 K, ± 0.3 dex, and ± 0.2 dex in effective temperatures, surface gravities, and metallicities, respectively. We achieved completeness between 74-98 % and typical purity between 39-54 % in this selection

⌨️ In this paper, we present a procedure for the identification of stars with similar atmospheric parameters, before any radiative transfer analysis is performed

We used projection maps created by the t-SNE dimensionality reduction algorithm applied directly to the spectra using pixels as dimensions

♟️CHESS stands for the CHEmical Survey analysis System, a pipeline that aims to provide precise and accurate atmospheric parameters and abundances for large samples of FGK-type stars

⭐ For that, we use multiple instances of differential analysis done against samples of reference stars

🇪🇺 Members of the #SAGATeamCAMK are involved in the working group responsible for the exoplanet, stellar, and Galactic science case. The WST project is funded by the European Union under Grant ID 101183153 awarded within the HORIZON-INFRA-2024-DEV-01 call (cordis.europa.eu/project/id/1...)

👩‍🏫 This first issue of the WST Chronicle includes descriptions of the WST consortium and its organisation, an overview of the science drivers and the top‐level requirements, and a presentation of the project timeline, among other information

🤯 The Wide-Field Spectroscopic Telescope is a project to build a 12m telescope fully dedicated to multi-object spectroscopy. It will have a large FoV (>3 deg^2) and combine high‐multiplex spectrographs of both low‐ and high‐resolution and a giant panoramic integral field spectrograph

The attached figure shows how our two stars compare to other known metal-poor stars that are rich in neutron capture elements (showing in particular, the chemical element europium).

👨‍🏫 Finally, we also found that the chemical abundances in the two stars seem consistent with expectations for stars enriched by a single population III core collapse supernova. If true, this would make the two stars part of the second generation of stars being formed in the Universe.

🚀 The other star, called TYC 9219-2422-1, is part of the Galactic halo and was formed outside the Milky Way, in the dwarf galaxy that merged with the Milky Way some 9 billion years ago and is now called the Gaia-Enceladus merger event.

👵 We found that the star called BPS CS 29529-0089 was formed in proto-disk of the Milky Way, the structure that was just starting to form the disk of our Galaxy some 12 billion years ago.