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Lara Delbroek10/11/2026, 09:00Talks
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Amit Kashi (Ariel University)10/11/2026, 09:30Talks
Massive stars eject strong winds that affect their evolution. When in a binary system, their winds collide and emit radiation across the spectrum, providing an opportunity to study the stars and the interaction between them. I will present simulations that include a detailed treatment of wind ejection, orbital motion, clumpiness, and more. I will discuss the results of systematic simulations...
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Federico Rizzuti10/11/2026, 09:50Stellar AtmospheresTalks
The increasing quality of spectroscopic observations has been providing unprecedented constraints on stellar evolution and nucleosynthesis theory. Interpreting these data requires an accurate understanding of the evolution of stars and the chemical yields they produce. In particular, complex multi-dimensional processes such as internal mixing and magnetic fields represent some of the main...
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Dongwook Lim (Yonsei University)10/11/2026, 11:10Stellar AtmospheresTalks
High-resolution near-infrared (NIR) spectroscopy is an increasingly important tool for stellar chemical abundance studies, especially for dust-obscured stars and chemical species that are difficult to measure in optical spectra. IGRINS and IGRINS-2 are leading instruments that provide simultaneous H- and K-band spectra at a resolving power of R ~ 45,000. However, several IGRINS-based studies...
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Ricardo Albarracín (Max Plank Institute for Astronomy)10/11/2026, 11:30Talks
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ELla Wang (Stockholm University)10/11/2026, 11:50Stellar AtmospheresTalks
3D NLTE radiative transfer provides the most physically realistic framework for interpreting high quality stellar spectra. Existing stellar spectroscopic surveys have observed on the order of one million stars, and upcoming surveys such as 4MOST and WEAVE will increase this number by an order of magnitude. The scale of these data sets presents a significant challenge: deriving accurate stellar...
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Nicholas Storm10/11/2026, 13:30Stellar AtmospheresTalks
In this talk, I will present recent advances in our understanding of the history of Galactic nucleosynthesis, driven by new observational data and improved stellar modelling. A key focus will be on insights into stellar chemical abundances made possible by state-of-the-art 3D radiation-hydrodynamics stellar atmospheres and non-local thermodynamic equilibrium (NLTE) spectral models. These...
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Mila Racca (Stockholm University)10/11/2026, 14:00Stellar AtmospheresTalks
The astrophysical site(s) of the rapid neutron-capture (r-) process remain one of the major open questions in nuclear astrophysics. Metal-poor, r-process enhanced stars provide a unique fossil record of the earliest nucleosynthetic events, but the ability to discriminate between competing production sites relies on the accuracy of the inferred stellar abundance patterns
We present a new...
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Bakuh Danang Setyo Budi (SOKENDAI/NAOJ)10/11/2026, 14:20Stellar AtmospheresTalks
Oxygen abundances in very and extremely metal-poor (V/EMP) stars provide critical constraints on early massive stars' nucleosynthesis. We present an oxygen abundance analysis for 35 V/EMP stars ($-4.0<\text{[Fe/H]}<-1.5$) using near-infrared $H$-band OH lines from high-resolution Subaru/IRD spectra. To evaluate these atmospheric diagnostics, we compare OH-based abundances against the...
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Dr Riano Giribaldi (INAF)Stellar AtmospheresTalks
Heavy elements-to-europium ratios are frequently adopted as a tracers of the relative contributions of the slow (s) and rapid (r) neutron-capture processes. These indicators may be non-deterministic at low metallicity. Therefore, we optimise the isotopic fraction determination via modelling Ba resonance lines. We tested the performance of 1D LTE and 1D NLTE for determining barium abundance...
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