# Fossil magnetic fields in intermediate-mass and massive stars

## TL;DR

This paper reviews recent studies on fossil magnetic fields in intermediate-mass and massive stars, focusing on their origin, evolution, and magnetic properties in pre-main sequence and binary systems.

## Contribution

It provides new insights into the formation and evolution of fossil magnetic fields through observational studies of young stars and binaries.

## Key findings

- Fossil magnetic fields are stable and organized on large scales.
- Pre-main sequence stars exhibit magnetic properties linked to fossil fields.
- Binary systems offer clues to magnetic field evolution.

## Abstract

A small fraction of the population of intermediate-mass and massive stars host strong and stable magnetic fields organised on large scales. These fields are believed to be remnants of star formation. It is however not clear how such fossil fields have been shaped during their formation and subsequent evolution. We report recent and ongoing studies on the magnetic properties of pre-main sequence stars and main sequence binaries, allowing us to make progress in this field.