Abell 43: Longest period Planetary Nebula Nucleus variable

TL;DR

This study reports the detection of long-period pulsations in the planetary nebula nucleus Abell 43, revealing insights into its internal structure and pulsation mechanisms.

Contribution

It presents the first high-speed photometry observations of Abell 43, identifying multiple pulsation periods and supporting theoretical models of g-mode pulsations.

Findings

Detected 6 pulsations in Abell 43 with periods between 2380 s and 6075 s

Identified 3 pulsations in NGC 7094 with periods between 2000 s and 5000 s

Results support g-mode pulsation models driven by the kappa-mechanism

Abstract

Based on 24h high speed photometry of the hybrid PG 1159 star Abell 43, we have detected 6 sighificant pulsations with periods between 2380 s and 6075 s. A short (4h) run on the almost spectroscopic twin NGC 7094 central star resulted in detection of 3 low amplitude pulsations with periods between 2000 s and 5000 s. The results are close to predictions for g-mode pulsations driven by the kappa-mechanism induced by the partial ionization of carbon and oxygen.