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Picture of Abbas Askar

Abbas Askar

Postdoc

Picture of Abbas Askar

MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters - III. Cataclysmic variables - implications of model assumptions

Author

  • D. Belloni
  • M. Zorotovic
  • Matthias R. Schreiber
  • Nathan W. C. Leigh
  • M. Giersz
  • A. Askar

Summary, in English

In this third of a series of papers related to cataclysmic variables (CVs) and related objects, we analyse the population of CVs in a set of 12 globular cluster models evolved with the MOCCA Monte Carlo code, for two initial binary populations (IBPs), two choices of common-envelope phase (CEP) parameters, and three different models for the evolution of CVs and the treatment of angular momentum loss. When more realistic models and parameters are considered, we find that present-day cluster CV duty cycles are extremely low (≲0.1 per cent) that makes their detection during outbursts rather difficult. Additionally, the IBP plays a significant role in shaping the CV population properties, and models that follow the Kroupa IBP are less affected by enhanced angular momentum loss. We also predict from our simulations that CVs formed dynamically in the past few Gyr (massive CVs) correspond to bright CVs (as expected) and that faint CVs formed several Gyr ago (dynamically or not) represent the overwhelming majority. Regarding the CV formation rate, we rule out the notion that it is similar irrespective of the cluster properties. Finally, we discuss the differences in the present-day CV properties related to the IBPs, the initial cluster conditions, the CEP parameters, formation channels, the CV evolution models and the angular momentum loss treatments.

Publishing year

2017-06-01

Language

English

Pages

2429-2446

Publication/Series

Monthly Notices of the Royal Astronomical Society

Volume

468

Document type

Journal article

Publisher

Oxford University Press

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • methods: numerical, novae, cataclysmic variables, globular clusters: general

Status

Published

ISBN/ISSN/Other

  • ISSN: 1365-2966