UV Spectroscopy of the Central Star of the Planetary Nebula A43
Ellen Ringat, Felix Friederich, Thomas Rauch, Klaus Werner, and, Jeffrey W. Kruk
TL;DR
This paper presents preliminary UV and optical spectral analysis of the hybrid PG1159 star in planetary nebula A43, revealing its hydrogen content and atmospheric properties using advanced NLTE models.
Contribution
It introduces a detailed spectral analysis of the hybrid PG1159 star A43 using multi-instrument UV and optical data with NLTE modeling techniques.
Findings
Identification of hydrogen in the star's spectrum
Determination of atmospheric composition and properties
Insights into the star's evolutionary status
Abstract
About 25% of all post-AGB stars are hydrogen-deficient, e.g. the PG1159 stars with a typical abundance pattern He:C:O = 33:50:17 (by mass). Only four of about 40 known PG1159 stars exhibit H in their spectra. The exciting star of the planetary nebula A43 is one of these so-called hybrid PG1159 stars. We present preliminary results of an on-going spectral analysis by means of NLTE model-atmosphere techniques based on UV spectra obtained with FUSE, HST/GHRS, and IUE as well as on optical observations.
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Taxonomy
TopicsAstronomy and Astrophysical Research · Stellar, planetary, and galactic studies · Gamma-ray bursts and supernovae