Probing the early history of the Milky Way through ancient carbon-rich stars

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• Anke Ardern-Arentsen / IoA
• Wednesday 19 February 2025, 13:40-14:05
• The Hoyle Lecture Theatre + Zoom .

If you have a question about this talk, please contact Xander Byrne.

The oldest, most metal-poor stars we find in the Milky Way today were born in pristine environments in the early Universe. These local, ancient stars contain unique clues about the First Stars and the early formation and evolution of our Galaxy. At low metallicity, many stars have been found to be enhanced in carbon, coming in two main types: some contain the fingerprints of the First Stars and others have experienced binary interaction with an evolved companion. I recently built a homogeneous sample of C-rich metal-poor stars using the Gaia XP spectra, employing a neural network and a dedicated training sample. I will present this recent paper and discuss how the change in frequency of C-rich stars with Galactic environment relates to globular clusters and clustered star formation in the early Universe.

This talk is part of the Institute of Astronomy Seminars series.

This talk is included in these lists:

• Cambridge Astronomy Talks
• Combined External Astrophysics Talks DAMTP
• Cosmology lists
• Cosmology, Astrophysics and General Relativity
• Institute of Astronomy Seminars
• Institute of Astronomy Talk Lists
• Kavli Institute for Cosmology Talk Lists
• Priscilla
• The Hoyle Lecture Theatre + Zoom

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