Skip to main content

Binary Population And Spectral Synthesis (BPASS)


Note that this page mirrors content on the BPASS page at http://bpass.auckland.ac.nz. This mirror is maintained by Elizabeth Stanway.

Have questions not answered here? CONTACT US: j.eldridge [at] auckland.ac.nz and e.r.stanway [at] warwick.ac.uk

The Binary Population and Spectral Synthesis code (BPASS) is the result of combining detailed binary stellar evolution models with libraries of synthetic atmosphere spectra to create a unique tool to model many details of stellar populations.

While similar codes (such as starburst99) exist BPASS has important features, which set it apart from other codes and in combination make it the cutting edge. First, and most important, is the inclusion of binary evolution in modelling the stellar populations. The general effect of binaries is to cause a population of stars to look bluer at an older age than predicted by single-star models. Secondly, detailed stellar evolution models are used rather than an approximate rapid population synthesis method. Thirdly, we use only theoretical model spectra i with as few empirical inputs as possible to create completely synthetic models to compare with observations. Fourthly, we encourage use of Cloudy (Ferland et al., 1998) to determine the nebular emission. Finally, the code is easily adaptable to determine the input physical parameters required to match observations.

On this site we make available standard outputs from our code for single and binary star populations. If you require data that is not here please email us with your request or suggestion.

The current version of the code is Version 2.2. (Released May 2018)

This release is accompanied by a release paper: Stanway & Eldridge (2018), which builds on the more detailed model description in Eldridge, Stanway et al (2017, PASA), arXiv:1710.02154



Current members of the BPASS team:

  • JJ Eldridge: j.eldridge [at] auckland.ac.nz
  • Elizabeth Stanway: e.r.stanway [at] warwick.ac.uk.
  • Lin Xiao
  • Liam McClelland
  • John Bray
  • Steph Greis

The creation of BPASS has been supported by:

  • Department of Physics, University of Auckland, New Zealand.
  • Department of Physics, University of Warwick, United Kingom.
  • Astrophysics Research Centre, Department of Physics, Queen’s University Belfast, Northern Ireland.
  • Institute of Astronomy, University of Cambridge, United Kingdom.
  • Institut d’Astrophysique de Paris, University de Pierre & Marie Curie, France.



This site also hosts other results from the Auckland Stars Group that are not included in BPASS. These can be found under the Other Results page. To date these numbers are based on the following paper:

 

BPASS image