BD-22 3467, a DAO-type star exciting the nebula Abell 35
M. Ziegler (1), T. Rauch (1), K. Werner (1), J. Koeppen (2), J. W., Kruk (3) ((1) Institute for Astronomy, Astrophysics, Kepler Center for, Astro, Particle Physics, Eberhard Karls University, Tuebingen, Germany,, (2) Observatoire Astronomique de Strasbourg

TL;DR
This study uses advanced NLTE model atmospheres to analyze the star BD-22 3467, revealing detailed elemental abundances and stellar parameters, and suggesting its evolutionary path differs from typical planetary nebula progenitors.
Contribution
It introduces state-of-the-art fully metal-line blanketed NLTE models for spectral analysis, identifying new elements and refining stellar parameters of BD-22 3467.
Findings
Determined Teff = 80 +/- 10 kK and log g = 7.2 +/- 0.3.
Identified argon, chromium, manganese, cobalt, and nickel for the first time in this star.
Revealed elemental abundances ranging from 1/100 to 70 times solar.
Abstract
Spectral analyses of hot, compact stars with NLTE (non-local thermodynamical equilibrium) model-atmosphere techniques allow the precise determination of photospheric parameters. The derived photospheric metal abundances are crucial constraints for stellar evolutionary theory. Previous spectral analyses of the exciting star of the nebula A 35, BD-22 3467, were based on He+C+N+O+Si+Fe models only. For our analysis, we use state-of-the-art fully metal-line blanketed NLTE model atmospheres that consider opacities of 23 elements from hydrogen to nickel. For the analysis of high-resolution and high-S/N (signal-to-noise) FUV (far ultraviolet, FUSE) and UV (HST/STIS) observations, we combined stellar-atmosphere models and interstellar line-absorption models to fully reproduce the entire observed UV spectrum. The best agreement with the UV observation of BD-22 3467 is achieved at Teff = 80…
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