SAGA Team

The Wide-Field Spectroscopic Telescope | WST | Project | Fact Sheet | HORIZON | CORDIS | European Commission We propose a conceptual design study for a 12-metre wide-field spectroscopic survey telescope (WST) with simultaneous operation of a large field-of-view (3 sq. degree), high-multiplex (20,000) multi-o...

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 second issue of the WST Chronicle is out!

www.dropbox.com/scl/fi/zmd3m...

📄 The WST Chronicle is an electronic magazine designed to keep the WST science teams and the broader scientific community updated on the latest developments of the project

🔭 ☄️ #stellarastro #galactic #instrumentation

⚠️ "Krytyczna sytuacja finansowa CAMK PAN: Instytut naukowy płaci za błędy państwa sprzed dekad

www.camk.edu.pl/pl/archiwum/...

#Nauka #Polska

Oooh the Nobel Prize is out today, so it's time for my yearly round of ignoring that news and reading about many of the women who were snubbed of the prize in the past and who the Nobel Prize committee refuses to apologise for. 🧪🔭

how to win a nobel physics prize 🔭✨☄️

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

🔭 New paper of the @sagateam.bsky.social accepted in A&A!

This is the first paper of the upcoming "Playing CHESS with stars" series!

The paper was lead by John Martínez Fernández and Sergen Özdemir, Ph.D. students at the SAGA Team

arxiv.org/abs/2509.19443

#stellarastro #SagaTeamCAMK

The High-Resolution Multi-Object Spectrograph (HRMOS) has a new webpage:

www.hrmos.eu

HRMOS will be proposed as a new instrument for the Very Large Telescope of ESO as part of the VLT2030 roadmap

It will combine very high-resolution (80k), >50 multiplex, and high RV precision

#instrumentation 🔭

Congrats to the CUBES consortium!

Getting an account on the RSP Before getting started: Understand whether you have Rubin data rights.- Rubin data rights are required in order to hold an account in the Rubin Science Platform., All scientists and students affili...

🔭 Friendly advice for astronomers in the US and Chile--if you are excited to access @vrubinobs.bsky.social Data Preview 1 on Monday, request your account *now*--it has to get approved by a human. For best results use your university single-sign on, if available.

rsp.lsst.io/guides/getti...

A photo of the slide with the December 2026 release date

Finding out about Gaia at #EAS2025Cork! ☄️

Just announced: Gaia DR4 will be released in December 2026!

Oh, and teaser: We have plans to release high level spectra like HASP but for each unique COS and STIS target ever observed by #Hubble since STIS started operating in 1997 🔭🧪

🇪🇺 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

🔭 ☄️ #stellarastro #galactic #instrumentation

🤩First issue of the WST Chronicle

www.wstelescope.com/wst-chronicle

📰 The WST Chronicle is an electronic magazine designed to keep the WST science teams and the broader scientific community updated on the latest developments of the project

🔭 ☄️ #stellarastro

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.

🛠💻 In this work, we investigated in detail the properties of two old metal-poor stars. We determined abundances of 27 neutron-capture elements for them. We also investigated their orbits in the Galaxy and tried to understand the origin of these stars.

💥 In these processes, the atoms are gradually capturing several neutrons until at a later time some of the additional neutrons decay and transform into protons. When this happens, the atom becomes a new, heavier, chemical element.

⭐️ The bottom half of the periodic table, containing the elements heavier than Fe, cannot be produced by normal nuclear burning inside stars. They are produced by what astronomers call "neutron-capture processes".

👨‍🎓 The paper is led by André Rodrigo da Silva, member of the SAGA Team, Ph.D. student of the GeoPlanet Doctoral School working at the Centrum Astronomiczne im. M. Kopernika PAN

This work was funded by an OPUS grant of @ncn.gov.pl

🚨New paper alert! 🔭☄️🧪

📄 The paper entitled: "Discovery of a pair of very metal-poor stars enriched in neutron-capture elements: The proto-disk r-II star BPS CS 29529-0089 and the Gaia-Sausage-Enceladus r-I star TYC 9219-2422-1" was accepted for publication in A&A

See:
arxiv.org/abs/2503.04926