# HAYDN -- High-precision AsteroseismologY of DeNse stellar fields (ESA Voyage 2050 White Paper)

## TL;DR

HAYDN proposes a dedicated space mission to enhance asteroseismology by providing high-precision, long-duration photometric data in dense stellar fields, aiming to advance stellar physics and Galactic archaeology.

## Contribution

It advocates for a new space mission focused on dense stellar fields to improve asteroseismic studies and address key questions in stellar and Galactic evolution.

## Key findings

- Asteroseismology enables precise stellar characterization.
- High-cadence data will improve understanding of metal-poor stars.
- Mission will shed light on cluster evolution and Galactic assembly.

## Abstract

In the last decade, the Kepler and CoRoT space-photometry missions have demonstrated the potential of asteroseismology as a novel, versatile and powerful tool to perform exquisite tests of stellar physics, and to enable precise and accurate characterisations of stellar properties, with impact on both exoplanetary and Galactic astrophysics. Based on our improved understanding of the strengths and limitations of such a tool, we argue for a new small/medium space mission dedicated to gathering high-precision, high-cadence, long photometric series in dense stellar fields. Such a mission will lead to breakthroughs in stellar astrophysics, especially in the metal poor regime, will elucidate the evolution and formation of open and globular clusters, and aid our understanding of the assembly history and chemodynamics of the Milky Way's bulge and few nearby dwarf galaxies.