... | ... | @@ -91,66 +91,35 @@ The PopStar grids are described in [Molla et al. (2009)](http://cdsads.u-strasbg |
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### Installing BPASS grids
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The BPASS (Binary Population and Spectral Synthesis) stellar population synthesis models are available [here](http://bpass.auckland.ac.nz/index.html). We support importing the v2.0 grids that can be downloaded [here](http://bpass.auckland.ac.nz/2.html) under the header "SEDs", as well as the v2.1 grids that are available [here](http://bpass.auckland.ac.nz/8.html). The grids are available as tarballs for several different choices of the initial mass function. The tarball contains grids assuming either an instantaneous starburst of 1e6 Msol, or continuous star formation of 1 Msol/yr lasting 1e6 years (the latter only for v2.0). Each of these grids has separate models for single-star and binary-star evolution. Grids are available for a range of metallicities ranging from Z=0.001 to 0.040 (v2.0) or Z=0.00001 to 0.040 (v2.1). The first step is to download one or more of the tarballs from the BPASS website. Next you run the script [convert_bpassv2.x.pl](https://data.nublado.org/stars/convert_bpassv2.x.pl) (make sure that the file has execute permission). Below we describe the process for a BPASS v2.0 grid:
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The BPASS (Binary Population and Spectral Synthesis) stellar population synthesis models are available [here](http://bpass.auckland.ac.nz/index.html). We support the v2.0 through v2.3 releases. These have been converted into Cloudy format and can be downloaded [here](http://data.nublado.org/stars/bpass). The grids are available for several different choices of the initial mass function. There are grids for either an instantaneous starburst of 1e6 Msol, or continuous star formation of 1 Msol/yr lasting 1e6 years (the latter only for v2.0). Each of these releases has separate grids for single-star and binary-star evolution. Grids are available for a range of metallicities ranging from Z=0.001 to 0.040 (v2.0) or Z=0.00001 to 0.040 (all later versions). The first step is to download the compressed ASCII file. Below we will use the v2.3 release as an example.
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```
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<download bpassv2-imf135-100.tar.gz from BPASS website>
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<download convert_bpassv2.x.pl>
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chmod +x convert_bpassv2.x.pl
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tar xvfz bpassv2-imf135-100.tar.gz
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cd BPASSv2_imf135_100
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../convert_bpassv2.x.pl
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<download BPASSv2.3_imf135_300.a+00_burst_single.ascii.xz>
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<download BPASSv2.3_imf135_300.a+00_burst_binary.ascii.xz>
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xz -d *.ascii.xz
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```
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Note that the last command has to process lots of data and will take several minutes to complete. It will create four very large ascii files:
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In the file name "burst" refers to the single starburst models and "cont" to the continuous star formation models. Furthermore, "single" refers to the single-star evolution models and "binary" to the binary-star evolution models.
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For Cloudy versions C17 and older, the ASCII files must be converted into binary files by starting Cloudy and typing:
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```
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BPASSv2_imf135_100_burst_binary.ascii
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BPASSv2_imf135_100_burst_single.ascii
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BPASSv2_imf135_100_cont_binary.ascii
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BPASSv2_imf135_100_cont_single.ascii
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compile stars "BPASSv2_imf135_100_burst_single.ascii"
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```
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Here "burst" refers to the single starburst models and "cont" to the continuous star formation models as outlined above.
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Furthermore, "single" refers to the single-star evolution models and "binary" to the binary-star evolution models.
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The ASCII files can be converted into binary files in the usual manner by starting Cloudy and typing
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and similar for each file that you downloaded. This step is optional for Cloudy versions C22 and later, but still recommended as the ASCII files are large and compiling them will speed up reading them. For Cloudy versions C17 and older, you now need to move the resulting *.mod files into the data directory. For Cloudy versions C22 and later, you need to move the *.ascii and *.idx (if present) files into the data directory. After this, they can then be used in Cloudy.
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```
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compile star "BPASSv2_imf135_100_burst_binary.ascii"
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```
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and similar for the other three files.
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After moving the binary files into the data directory, they can then be used in Cloudy.
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These are 2D grids allowing interpolation in age and metallicity.
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You can produce a mix of single and binary stars using e.g.:
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These are 2D grids allowing interpolation in age and metallicity. You can produce a mix of single and binary stars using e.g.:
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```
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table star "BPASSv2_imf135_100_cont_single.mod" 2e8 -1.8
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table star "BPASSv2.3_imf135_300.a+00_burst_single.ascii" 2e8 -1.8
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intensity <xxx>
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table star "BPASSv2_imf135_100_cont_binary.mod" 2e8 -1.8
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table star "BPASSv2.3_imf135_300.a+00_burst_binary.ascii" 2e8 -1.8
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intensity <yyy>
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```
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The code for calculating the grids is described in [Eldridge & Stanway (2006)](http://adsabs.harvard.edu/abs/2009MNRAS.400.1019E).
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The instructions for installing a BPASS v2.1 grid are very similar:
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```
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<download BPASSv2.1_imf135_100.tar from BPASS website>
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<download convert_bpassv2.x.pl>
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chmod +x convert_bpassv2.x.pl
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tar xvf BPASSv2.1_imf135_100.tar
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cd BPASSv2.1_imf135_100
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../convert_bpassv2.x.pl
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```
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This will create two ascii files:
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```
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BPASSv2p1_imf135_100_burst_single.ascii
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BPASSv2p1_imf135_100_burst_binary.ascii
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```
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As was already mentioned above, continuous star formation files are no longer produced in v2.1, hence only two files are produced instead of four. The remainder of the procedure for using the ASCII files is the same as above.
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This version of the grid is described in [Eldridge et al. (2017)](https://arxiv.org/abs/1710.02154)
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For Cloudy versions C17 and older, you need to replace the ".ascii" file name extension with ".mod".
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The BPASS v2.3 release is described in [Byrne et al. (2022)](https://ui.adsabs.harvard.edu/abs/2022MNRAS.512.5329B/abstract) and [Stanway & Eldridge (2018)](https://ui.adsabs.harvard.edu/abs/2018MNRAS.479...75S/abstract). For the older releases, each [subdirectory](http://data.nublado.org/stars/bpass) contains a README file that contains instructions how to cite the release.
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### Installing your own grids
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