Forbidden calcium lines as disc tracers

TL;DR

Forbidden calcium emission lines serve as effective tracers for studying the kinematics of high-density discs around evolved massive stars, as demonstrated through spectroscopic survey results.

Contribution

This paper introduces the use of forbidden calcium lines as novel tracers for disc kinematics in evolved massive stars.

Findings

Forbidden calcium lines effectively trace disc kinematics.

Spectroscopic survey confirms the utility of these lines.

High-density discs around evolved stars can be studied using these lines.

Abstract

Forbidden emission lines are particularly valuable disc tracers, because their profiles reflect the kinematics within their formation region. Here we present a short excerpt from the results of a spectroscopic survey of evolved massive stars surrounded by high-density discs.