Binary Population and Spectral Synthesis
Latest BPASS version 2.2.1 Data Release (July 2018)
This version of BPASS represents an extension and modification of our v2.1 and older 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 including Lick indices, inclusion of new stellar atmosphere models, improvements in the treatment of low mass stars, and modified binary parameter distributions. These result in significantly better handling of old stellar populations
BPASS v2.1 was fully described in a peer-reviewed paper: Eldridge, Stanway et al, 2017, PASA 34 58.
This data release, v2.2, and subrelease v2.2.1, builds on the detailed modelling described in that paper, but includes improved or modified prescriptions in some areas. These are described and results presented in Stanway & Eldridge (2018, MNRAS).
We have also produced an updated 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 v2.2.1 data release is routinely stored on Google Drive at https://drive.google.com/drive/folders/1BS2w9hpdaJeul6-YtZum--F4gxWIPYXl?usp=sharing
The original v2.2 data release (May 2018) is still online at https://drive.google.com/drive/u/1/folders/1GfMSO2ZiIabHSQRh7zTA3I51DPGbmtAB - the differences are very slight for most applications and resulted from fixing a bug that affected scaling of a handful of hot, young white dwarf atmospheres. (see v2.2.1 README).
Filenames have now been updated to incorporate IMF names as described in the user manual. 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:
- v2.2 Binary stellar models with photometric colours
- v2.1 OB star 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
- Lick Indices
- Mass to Light Ratios
- Colour-Magnitude Diagram (CMD) making code
For full details, and README details for the data files, we again recommend the User Manual.
We would appreciate the inclusion of the following acknowledgement where appropriate:
“This work made use of v2.2.1 of the Binary Population and Spectral Synthesis (BPASS) models as described in Eldridge, Stanway et al. (2017) and Stanway & Eldridge et al. (2018).”
License: The results from BPASS and CURVEPOPS available on this site licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.