WARNING: Pages and data still in development, if I've made a mistake or not explained something please email me, jje [at] ast.cam.ac.uk or firstname.lastname@example.org.
The Binary Population and Spectral Synthesis code (BPASS, Eldridge & Stanway, 2009) is the result of combining my 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 five important features, each of 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, I use only theoretical model spectra in my syntheses with as few empirical inputs as possible to create completely synthetic models to compare with observations. Fourthly, I use Cloudy (Ferland et al., 1998) to determine the nebular emission. This means I model not only the stars in detail but also the surrounding gas. Finally, the code is easily adaptable to determine the input physical parameters required to match observations. I have invested a great amount of time and effort to create BPASS. The development is now complete and it is at the centre of much of my current and future research.
On this site we make available standard outputs from our code for single and binary star populations. Select the data you require from the menu on the left. If you require data that is not here please email us.
Full details of the code can be found in the following papers, please reference these papers if you use the results in your research.
- Eldridge & Stanway, 2012, MNRAS, 419, 479. The effect of stellar evolution uncertainties on the rest-frame ultraviolet stellar lines of C IV and He II in high-redshift Lyman-break galaxies.
- Eldridge, Langer & Tout, 2011, MNRAS, 414, 3501. Runaway stars as progenitors of supernovae and gamma-ray bursts.
- Eldridge & Stanway, 2009, MNRAS, 400, 1019. Spectral population synthesis including massive binaries.
- Eldridge, Izzard & Tout, 2008, MNRAS, 384, 1109. The effect of massive binaries on stellar populations and supernova progenitors.
- Eldridge, 2012, MNRAS in press.Stochasticity, a variable stellar upper-mass limit, binaries and star-formation rate indicators.
- Eldridge & Relaño, 2011, MNRAS, 411, 235. The red supergiants and Wolf-Rayet stars of NGC 604.
- Eldridge, 2009, MNRAS, 400, 20. A new-age determination for γ2 Velorum from binary stellar evolution models.
Do you need a number and no one else can help?
Then maybe you should email the BPASS team:
Thursday March 29th 2012, Talk at the UK/German National Astronomy Meeting.