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BPASS v2.1

Latest BPASS version 2.1 Data Release (October 2017)

This version of BPASS represents an extension and modification of our older v1 and v2.0 models.

The more important new features and results included in this release of BPASS include: calculation of a significantly larger number of stellar models, release of a wider variety of predictions of stellar populations, inclusion of new stellar atmosphere models, a wider range of metallicities, binary models are now included for the full stellar mass range and a broader range of compact remnant masses are now calculated in secondary models.

Most crucially, BPASS has now been fully described in a peer-reviewed paper: Eldridge, Stanway et al, 2017, PASA in press, arXiv:1710.02154

We have also produced a User Manual which we strongly recommend users examine. This is available typeset in both Arial and OpenDyslexic (a font designed for use by those with specific learning differences).

The data release is routinely stored on Sharepoint at


and will be available soon from the PASA data store. We caution that the full data release is very large (particularly if individual stellar models are downloaded). It comprises a directory structure, sorted by IMF, with tarballs containing data products as follows:

1. Stellar Model Outputs:

  • Binary stellar models with photometric colours
  • New OB stars atmosphere models

2. Stellar Population Outputs (all versus age):

  • Massive star type number counts
  • Core collapse supernova rates
  • Yields, energy output from winds and supernovae and ejected yields of X , Y and Z
  • Stellar population mass remaining
  • HR diagram (isochronal contours)

3. Spectral Synthesis Outputs (all versus age):

  • Spectral Energy Distributions
  • Ionizing flux predictions
  • Broadband colours
  • Colour-Magnitude Diagram (CMD) making code

For full details, and README details for the data files, we again recommend the User Manual.

For the Xiao, Stanway & Eldridge (2018) nebular gas emission models please see our nebular emission sub page.

We would appreciate the inclusion of the following acknowledgement where appropriate:
“This work made use of v2.1 of the Binary Population and Spectral Synthesis (BPASS) models as last described in Eldridge, Stanway et al (2017).”