IAU Symposium 419

IAU Symposium 419

Zooming in and out: Resolved and Unresolved Young Stellar Populations

This symposium is held as part of the 33rd IAU General Assembly.

DATES

August 17 – 19, 2027

PLACE

Auditorium Parco della Musica, Rome, Italy

Scientific Rationale

Young stellar populations shape the radiative, chemical, and mechanical evolution of galaxies. Yet, our understanding remains fragmented: studies of resolved massive stars, compact clusters, star-forming regions, and high-redshift galaxies often proceed in parallel rather than in concert. The advent of facilities such as JWST , ALMA, ELTs, and SDSS-V/LVM now makes it possible to connect these traditionally separate communities and trace feedback from sub-au disc scales to galactic environments and cosmic history. This symposium will unite observers, theorists, and modelers to (1) confront stellar-atmosphere and population-synthesis models with cutting-edge multi-wavelength data, (2) explore the role of multiplicity, mass transfer, and feedback in shaping young stellar populations, (3) bridge resolved and unresolved regimes via integral-field and interferometric observations, and (4) identify the observational and theoretical advances needed to unravel the life cycles of massive stars and their impact across the Universe.

Key topics

* A panchromatic view on massive stars and their feedback
* Connecting the stellar and pc-scale with JWST , LVM, and next-generation telescopes
* Confronting atmosphere and population models with ISM diagnostics
* The impact of binary and multiple evolution on population synthesis
* Gravitationally lensed young massive clusters
* Characteristics of transient events connected to young stellar populations
* Future observational and theoretical keystones to explain young stellar populations

Scientific Organization Committee