Circumstellar matter studied by spectrally-resolved interferometry

TL;DR

This paper reviews spectrally-resolved interferometry techniques and their application in studying circumstellar matter, highlighting historical development, key concepts, and interpretative approaches for astrophysical data.

Contribution

It offers a concise overview of the technique's evolution, fundamental principles, and practical interpretation methods, serving as a guide for researchers in the field.

Findings

Spectro-interferometry has advanced understanding of circumstellar environments.

Differential phase is crucial for recent astrophysical discoveries.

The paper provides interpretative 'cookbook' for specific cases.

Abstract

This paper describes some generalities about spectro-interferometry and the role it has played in the last decade for the better understanding of circumstellar matter. I provide a small history of the technique and its origins, and recall the basics of differential phase and its central role for the recent discoveries. I finally provide a small set of simple interpretations of differential phases for specific astrophysical cases, and intend to provide a "cookbook" for the other cases.