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  Comprehensive models of novae at metallicity Z = 0.02 and Z = 10−4

Chen, H.-L., Woods, T. E., Yungelson, L. R., Piersanti, L., Gilfanov, M., & Han, Z. (2019). Comprehensive models of novae at metallicity Z = 0.02 and Z = 10−4. Monthly Notices of the Royal Astronomical Society, 490(2), 1678-1692. doi:10.1093/mnras/stz2644.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-58A5-E Version Permalink: http://hdl.handle.net/21.11116/0000-0005-58A6-D
Genre: Journal Article

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Chen, Hai-Liang1, Author              
Woods, T. E., Author
Yungelson, L. R., Author
Piersanti, Luciano, Author
Gilfanov, M., Author
Han, Zhanwen, Author
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1High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: Novae are the observational manifestations of thermonuclear runaways on the surface of accreting white dwarfs (WDs). Although novae are an ubiquitous phenomenon, their properties at low metallicity are not well understood. Using the publicly-available stellar evolution code Modules for Experiments in Stellar Astrophysics (mesa), we model the evolution of accreting carbon–oxygen WDs and consider models that accrete matter with metallicity Z = 0.02 or 10−4. We consider both models without mixing and with matter enriched by CO-elements assuming that mixing occurs in the process of accretion (with mixing fraction 0.25). We present and contrast ignition mass, ejected mass, recurrence period, and maximum luminosity of novae for different WD masses and accretion rates for these metallicities and mixing cases. We find that models with Z = 0.02 have ignition masses and recurrence periods smaller than models with low Z, while the ejected mass and maximum luminosity are larger. Retention efficiency during novae outbursts decreases with increasing metallicity. In our implementation, inclusion of mixing at the H/He interface reduces accreted mass, ejected mass, and recurrence period as compared to the no-mixing case, while the maximum luminosity becomes larger. Retention efficiency is significantly reduced, becoming negative in most of our models. For ease of use, we provide a tabular summary of our results.

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 Dates: 2019-09-21
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz2644
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 490 (2) Sequence Number: - Start / End Page: 1678 - 1692 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150