Catching a grown-up starfish planetary nebula II. Plasma analysis and central star properties of PC 22

Abstract

After performing the morpho-kinematic analysis of the planetary nebula (PN) PC 22, we now present its nebular and stellar analysis. The plasma investigation relies on the novel use of a Monte Carlo analysis associated to the PyNeb code for the uncertainty propagation. The innermost region of the nebula shows electronic temperatures $T_{\mathrm{e}}$ $\approx$ 10,800~K using [NII] and $\approx$ 13,000 K using [OIII] and electronic densities $n_{\mathrm{e}}$ $\approx$ 600~cm${}^{-3}$. We also used for the first time a Machine Learning Algorithm to calculate Ionisation Correction Factors (ICFs) specifically adapted to PC 22. This has allowed us to have pioneer ICFs for (S${}^{+}$ + S${}^{++}$)/O${}^{++}$, Cl${}^{++}$/O${}^{++}$, and Ar${}^{3+}$+Ar${}^{4+}$, as well as a possible new determination for the total abundance of neon. The study of the stellar spectrum revealed the presence of broad emission lines consistent with a Wolf-Rayet-type [WR] classification and more precisely a [WO1]-subtype based on different qualitative and quantitative criteria. This classification is also coherent with the high stellar temperature derived from the reproduction of the ionization state of the gas with the Mexican Million Models database (3MdB) and the best fit model obtained with the NLTE model atmosphere code PoWR. PC 22 is therefore a new addition to the [WO1]-subtype PNe.

19 pages, 11 figures, 9 tables. Accepted for publication in Monthly Notices of the Royal Astronomical Society

References in corpus (14)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• The Ĝ Infrared Search for Extraterrestrial Civilizations with Large Energy Supplies. III. The Reddest Extended Sources in WISE
• Catalogue of central stars of planetary nebulae: Expanded edition
• The born again (VLTP) scenario revisited: The mass of the remnants and implications for V4334 Sgr
• Identification of NeVIII lines in H-deficient (pre-) white dwarfs: a new tool to constrain the temperature of the hottest stars
• Co-spatial Long-slit UV/Optical Spectra of Ten Galactic Planetary Nebulae with HST/STIS I. Description of the Observations, Global Emission-line Measurements, and CNO Abundances
• UV spectral analysis of very hot H-deficient [WCE]-type central stars of planetary nebulae: NGC 2867, NGC 5189, NGC 6905, Pb 6, and Sand 3
• IFU spectroscopy of Southern Planetary Nebulae V: Low-ionization structures
• Planetary nebulae with Wolf-Rayet-type central stars -- I. The case of the high-excitation NGC 2371
• NGC 6309, a Planetary Nebula that Shifted from Round to Multipolar
• Wolf-Rayet stars in M81 using GTC/OSIRIS: 7 new detections, analysis and classification of the full sample
• WR 72: a born-again planetary nebula with hydrogen-poor knots
• Catching a Grown-Up Starfish Planetary Nebula: I. Morpho-Kinematical study of PC 22

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