Stellar Models
As part of my posdoc position at UoA and UCSD I created a selection of stellar atmosphere models using ATLAS/SYNTHE and PHOENIX. I also created sets of stellar interior models using MESA. You can download these various models from this page
The models were created using low metallicities and non-standard compositions (i.e. not simply scaled-solar metallicities). Globular clusters have been shown to contain multiple populations with differing values of [C/Fe], [N/Fe] and [O/Fe] in addition to non-solar helium abundances, and we used these models to investigate the effect of these abundances on stellar evolution.
MESA models
I used MESA to create stellar interior models, with non-standard abundances. The resulting isochrones are available by following the links in the table below. The isochrones are at ages of 1, 5, and 13.5 Gyr, and extend from ~0.6 Msun to 0.04 Msun. The file names give the composition adopted, in the form mesa_fehm17_y040_cm010np030om01.iso, where fehm17 corresponds to [Fe/H]=-1.7, y040 denotes Y=0.40, cm01 denotes [C/Fe]=-0.10, np030 denotes [N/Fe]=+0.30, and om01 denotes [O/Fe]=-0.1
COMPOSITION/Age | ||||
---|---|---|---|---|
Y | Age | 1 Gyr | 5 Gyr | 13.5 Gyr |
0.24 | 1Gyr | 5Gyr | 13.5Gyr | |
0.32 | 1Gyr | 5Gyr | 13.5Gyr | |
0.33 | 1Gyr | 5Gyr | 13.5Gyr | |
0.34 | 1Gyr | 5Gyr | 13.5Gyr | |
0.36 | 1Gyr | 5Gyr | 13.5Gyr | |
0.38 | 1Gyr | 5Gyr | 13.5Gyr | |
0.40 | 1Gyr | 5Gyr | 13.5Gyr | |
0.44 | 1Gyr | 5Gyr | 13.5Gyr |
ATLAS/SYNTHE
ATLAS/SYNTHE were used to create stellar atmosphere models for temperatures from 6000K down to ~3700K, at a selection of values for Log(g), and for a wavelength range of 250 - 2000 nm. The model grid is accessible from the table below. Files within the subdirectories are named giving the Teff and Log(g), following the format atlas_4000k_logg4.0.dat. The files are ascii format, with columns of Wavlength (nm) and Flux (erg/sec/cm2/Angstrom/Steradian). An introduction to running ATLAS/SYNTHE models can be found in pdf form here.
If you'd like to run your own ATLAS/SYNTHE models at any of the compositions listed in the table below, the ODF tables are available here.
ATLAS9
COMPOSITION | ||||
---|---|---|---|---|
[C/Fe] | [N/Fe] | +0.30 | +0.90 | +1.45 |
-0.65 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | |
-0.20 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | |
+0.20 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 |
SYNTHE
COMPOSITION | ||||
---|---|---|---|---|
[C/Fe] | [N/Fe] | +0.30 | +0.90 | +1.45 |
-0.65 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | |
-0.20 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | |
+0.20 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 | [O/Fe]=-0.10, +0.20, +0.50 |
PHOENIX
PHOENIX was used to create low temperature models, below the limits for ATLAS/SYNTHE. The grid is not as complete as the ATLAS/SYNTHE grid, but still covers a few different compositions. The model grid is accessible here. A big thank you to Peter Hauschildt and Derek Homeier for their help in running these models.