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Galaxies 2018, 6(3), 79;

The Real-Time Evolution of V4334 Sgr

Royal Observatory of Belgium, Ringlaan 3, B-1180 Brussels, Belgium
Instituto de Astronomía, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta 1240000, Chile
Institut für Astro- und Teilchenphysik, Universität Innsbruck, Technikerstr. 25/8, 6020 Innsbruck, Austria
School of Physics & Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Leiden Observatory, Leiden University, Niels Bohrweg 2, NL-2333 CA Leiden, The Netherlands
Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC V8W 3P6, Canada
Space Radio-Diagnostics Research Centre, University of Warmia and Mazury, Prawochenskiego Str. 9, 10-720 Olsztyn, Poland
Author to whom correspondence should be addressed.
Received: 19 June 2018 / Revised: 23 July 2018 / Accepted: 24 July 2018 / Published: 26 July 2018
(This article belongs to the Special Issue Asymmetric Planetary Nebulae VII)
PDF [467 KB, uploaded 27 July 2018]


V4334 Sgr (Sakurai’s object) is an enigmatic evolved star that underwent a very late thermal pulse a few years before its discovery in 1996. It ejected a new hydrogen-deficient nebula in the process. The source has been observed continuously since, at many wavelengths ranging from the optical to the radio regime. In this paper we evaluate these data and discuss the evolution of this object. We reach the conclusion that we have seen no evidence for photoionization of the nebula yet and that the spectral features we see are caused either by shocks or by dust. These shocks are an integral part of the hydrodynamic shaping that is now producing a new bipolar nebula inside the old planetary nebula (PN), implying that we have a detailed observational record of the very early stages of the shaping of a bipolar nebula. View Full-Text
Keywords: stellar mass loss; stellar evolution; planetary nebulae; circumstellar dust stellar mass loss; stellar evolution; planetary nebulae; circumstellar dust

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Van Hoof, P.A.M.; Kimeswenger, S.; Van de Steene, G.C.; Avison, A.; Zijlstra, A.A.; Guzman-Ramirez, L.; Herwig, F.; Hajduk, M. The Real-Time Evolution of V4334 Sgr. Galaxies 2018, 6, 79.

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