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Variability and internal kinematics of the planetary nebula IC 4997
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Variability and internal kinematics of the planetary nebula IC 4997
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Journal Article
Variability and internal kinematics of the planetary nebula IC 4997
2023
Overview
We present new high-spectral resolution échelle spectra of IC 4997 obtained in 2023 June to study the evolution of its recently reported variable Hα emission line profile. Compared with similar spectra from 2020 September, the new ones also show a single-peaked profile but the full velocity width of the Hα wings has increased by a factor of; 1.2. Besides, we use our high-resolution échelle spectra to investigate the internal kinematics of the nebula. Preliminary analysis suggests that the two shells of IC 4997 are kinematically resolved: the outer shell expands at; 10–14 km s-1 and the inner shell at; 25 km s-1.
Publisher
Cambridge University Press
Subject
