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Galaxies 2018, 6(3), 88; https://doi.org/10.3390/galaxies6030088

Revealing the True Nature of Hen 2-428

1
Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
2
Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str. 24/25, 14476 Potsdam, Germany
3
Instituto de Astrofísica de La Plata, UNLP-CONICET, La Plata, 1900 Buenos Aires, Argentina
4
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 19 June 2018 / Revised: 7 August 2018 / Accepted: 10 August 2018 / Published: 14 August 2018
(This article belongs to the Special Issue Asymmetric Planetary Nebulae VII)
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Abstract

The nucleus of Hen 2-428 is a short orbital period (4.2 h) spectroscopic binary, whose status as potential supernovae type Ia progenitor has raised some controversy in the literature. We present preliminary results of a thorough analysis of this interesting system, which combines quantitative non-local thermodynamic (non-LTE) equilibrium spectral modelling, radial velocity analysis, multi-band light curve fitting, and state-of-the art stellar evolutionary calculations. Importantly, we find that the dynamical system mass that is derived by using all available He II lines does not exceed the Chandrasekhar mass limit. Furthermore, the individual masses of the two central stars are too small to lead to an SN Ia in case of a dynamical explosion during the merger process. View Full-Text
Keywords: binaries: spectroscopic; stars: atmospheres; stars: abundances; supernovae binaries: spectroscopic; stars: atmospheres; stars: abundances; supernovae
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Reindl, N.; Finch, N.L.; Schaffenroth, V.; Barstow, M.A.; Casewell, S.L.; Geier, S.; Miller Bertolami, M.M.; Taubenberger, S. Revealing the True Nature of Hen 2-428. Galaxies 2018, 6, 88.

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