A MiMeS analysis of the magnetic field and circumstellar environment of the weak-wind O9 sub-giant star HD 57682

TL;DR

This paper presents a comprehensive analysis of the magnetic field and circumstellar environment of the weak-wind O9 sub-giant star HD 57682, utilizing spectropolarimetric data and long-term observations to understand its magnetic properties and effects.

Contribution

It provides new measurements of the star's rotational period, magnetic field geometry, and insights into the influence of magnetic fields on its circumstellar environment.

Findings

Determined the star's rotational period from magnetic and Halpha variability.

Mapped the magnetic field geometry of HD 57682.

Analyzed the impact of magnetic fields on the circumstellar environment.

Abstract

I will review our recent analysis of the magnetic properties of the O9IV star HD 57682, using spectropolarimetric observations obtained with ESPaDOnS at the Canada-France-Hawaii telescope within the context of the Magnetism in Massive Stars (MiMeS) Large Program. I discuss our most recent determination of the rotational period from longitudinal magnetic field measurements and Halpha variability - the latter obtained from over a decade's worth of professional and amateur spectroscopic observations. Lastly, I will report on our investigation of the magnetic field geometry and the effects of the field on the circumstellar environment.