# The very fast evolution of Sakurai's object

## TL;DR

This paper reports on the rapid evolution of Sakurai's object, a star that experienced a late thermal pulse, with detailed spectral observations helping to refine stellar evolutionary models.

## Contribution

It provides new high-resolution spectral data and temporal analysis of Sakurai's object, enhancing understanding of its rapid post-thermal pulse evolution.

## Key findings

- Rapid change in optical emission lines since 2001
- Temporal evolution of morphological components observed
- Constraints on stellar evolution models improved

## Abstract

V4334 Sgr (a.k.a. Sakurai's object) is the central star of an old planetary nebula that underwent a very late thermal pulse a few years before its discovery in 1996. We have been monitoring the evolution of the optical emission line spectrum since 2001. The goal is to improve the evolutionary models by constraining them with the temporal evolution of the central star temperature. In addition the high resolution spectral observations obtained by X-shooter and ALMA show the temporal evolution of the different morphological components.