Symposium S9  26-27 June 2025

Stellar Ages Across the Cosmos: Unveiling the Chronology of the Universe

Aims and scope

Inferring precise and accurate ages of stars is fundamental to trace back the formation and evolution of galaxies, to constrain the age of the Universe, or to investigate numerous aspects of planetary system evolution. All these issues, so apparently distant, are closely related to our calibration and knowledge of the ages of the stars. Unfortunately, estimating the stellar age is very challenging because it cannot be directly measured. This symposium will bring together leading experts in different research areas (e.g. star and planetary formation and evolution, galaxy formation and evolution and cosmology) to explore stellar dating techniques and their implications for cosmology and astrophysics. The various methods of measuring stellar age will be discussed, including, e.g. improvement in isochrone fitting in the era of Gaia and the use of star clusters as benchmarks in age measurement, the application of asteroseismology to stellar ages, the power (and limit) of chemical clocks in inferring individual and statistical ages, the empirical methods related to lithium abundances, rotation and magnetic activity, such as gyrochronology, up to the only method able to provide a zero point in ages, e.g. cosmochronometry.

Programme

The symposium consists of six separate sessions with focus topic as follows:

  • Ages from Isochrones in the Era of Gaia: Models, Simulations, and Machine Learning
  • Ages from Isochrones in the Era of Gaia: Challenges and Insights from Large Surveys
  • Ages from Asteroseismology
  • Ages from Empirical methods: chemical clocks, gyrochronology, variable stars
  • Ages for Cosmology: Cosmochronometry and Stellar Population Studies
  • The accretion history of the Milky Way


To conclude the symposium, we will host a comprehensive discussion centered on developing a unified age scale for stars.

Invited talks will be 22 minutes long, followed by 3 minutes for Q&A. Contributed talks will be 11 minutes long, followed by 2 minute for Q&A. ePosters with short presentations will have a 1-minute timeslot.

Invited speakers

  • Anna Queiroz (IAC, Spain)
  • Aldo Serenelli (ICE-CSIC, Spain)
  • Camilla Danielski (INAF-Arcetri, Italy)
  • Louis Amard (University of Geneva, Switzerland)
  • Raúl Jiménez Tellado (University of Barcelona, Spain)
  • Andres Moya Bedon (University of Valencia, Spain)

Scientific organisers

  • Giada Casali (Chair, ANU, Australia)
  • Laura Magrini (co-Chair, INAF Arcetri, Italy)
  • Diane Feuillet (University of Uppsala, Sweden)
  • Jason Sanders (UCL, UK)
  • Andrea Miglio (University of Bologna, Italy)
  • Tiago Campante (IA, University of Porto, Portugal)
  • Vanessa Hill (Observatoire de la Côte d'Azur, France)
  • Licia Verde (ICC, University of Barcelona, Spain)
  • Diego Godoy Rivera (IAC, Spain)
  • Lorenzo Spina (INAF Arcetri, Italy)
  • Robin Jeffries (Keele University, UK)
  • Katja Poppenhager (AIP, Germany)

Contact

Updated on Tue Jun 10 16:04:49 CEST 2025
European Astronomical Society