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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


IMPACT FACTOR 2018: 0.350

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Volume 27, Issue 1

Issues

Spectral analysis of the binary nucleus of the planetary nebula Hen 2-428 – first results

Nicolle L. Finch
  • Corresponding author
  • Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
  • Email
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/ Nicole Reindl
  • Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
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/ Martin A. Barstow
  • Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
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/ Sarah L. Casewell
  • Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
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/ Stephan Geier
  • Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, D-72076 Tübingen, Germany
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/ Marcelo M. Miller Bertolami / Stefan Taubenberger
  • Max Planck Institut für Astrophysik, Karl- Schwarzschild-Str. 1, D-85748, Garching, Germany
  • European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748, Garching, Germany
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Published Online: 2018-04-04 | DOI: https://doi.org/10.1515/astro-2018-0017

Abstract

Identifying progenitor systems for the double-degenerate scenario is crucial to check the reliability of type Ia supernovae as cosmological standard candles. Santander-Garcia et al. (2015) claimed that Hen 2-428 has a doubledegenerate core whose combined mass significantly exceeds the Chandrasekhar limit. Together with the short orbital period (4.2 hours), the authors concluded that the system should merge within a Hubble time triggering a type Ia supernova event. Garcia-Berro et al. (2016) explored alternative scenarios to explain the observational evidence, as the high mass conclusion is highly unlikely within predictions from stellar evolution theory. They conclude that the evidence supporting the supernova progenitor status of the system is premature. Here we present the first quantitative spectral analysis of Hen 2-428which allows us to derive the effective temperatures, surface gravities and helium abundance of the two CSPNe based on state-of-the-art, non-LTE model atmospheres. These results provide constrains for further studies of this particularly interesting system.

Keywords: subdwarf; planetary nebula; type Ia

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About the article

Received: 2017-09-29

Accepted: 2017-12-31

Published Online: 2018-04-04


Citation Information: Open Astronomy, Volume 27, Issue 1, Pages 57–61, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2018-0017.

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© 2018, published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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