Two Nested Shells around the Blue Supergiant ALS 19653

TL;DR

This paper reports deep imaging of two nested shells around the blue supergiant ALS 19653, confirming the physical association of the outer shell with the star and providing insights into its circumstellar environment.

Contribution

The study provides the first detailed imaging evidence of nested shells around ALS 19653, revealing the star's circumstellar structure.

Findings

Outer shell is physically associated with ALS 19653

Deep narrowband imaging confirms the shells' structures

Nested shells suggest complex mass-loss history

Abstract

We present the results of deep narrowband imaging of two nested shells around the blue supergiant ALS 19653,which confirm that the outer shell is physically associated with the star.