galaxies-06-00088.pdf (641.07 kB)
Revealing the True Nature of Hen 2-428
journal contributionposted on 2019-09-18, 13:49 authored by N Reindl, NL Finch, V Schaffenroth, MA Barstow, SL Casewell, S Geier, MM Miller Bertolami, S Taubenberger
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.
N.R. is supported by a RC1851 research fellowship. N.L.F. is supported by an Science and Technology Facilities Council Studentship. Acknowledgments: This work is based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 085.D-0629(A) and 089.D-0453(A) based on data from the GTC PublicArchive at CAB (INTA-CSIC). The Tübingen Model-Atom Database (TMAD) service (http://astro-uni-tuebingen.de/~TMAD) used to compile atomic data for this work was constructed as part of the activities of the German Astrophysical Virtual Observatory. This research used the SPECTRE and ALICE High Performance Computing Facilities at the University of Leicester.
CitationGalaxies 2018, 6(3), 88
Author affiliation/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy
- VoR (Version of Record)