  The ever-expanding depth and quality of photometric and spectroscopic
observations of stellar populations increase the need for theoretical models in
regions of age-composition parameter space that are largely unexplored at
present. Stellar evolution models that employ the most advanced physics and
cover a wide range of compositions are needed to extract the most information
from current observations of both resolved and unresolved stellar populations.
The Dartmouth Stellar Evolution Database is a collection of stellar evolution
tracks and isochrones that spans a range of [Fe/H] from -2.5 to +0.5,
[alpha/Fe] from -0.2 to +0.8 (for [Fe/H] <=0) or +0.2 (for [Fe/H] >0), and
initial He mass fractions from Y=0.245 to 0.40. Stellar evolution tracks were
computed for masses between 0.1 and 4 Msun, allowing isochrones to be generated
for ages as young as 250 Myr. For the range in masses where the core He flash
occurs, separate He-burning tracks were computed starting from the zero age
horizontal branch. The tracks and isochrones have been transformed to the
observational plane in a variety of photometric systems including standard
UBV(RI)c, Stromgren uvby, SDSS ugriz, 2MASS JHKs, and HST ACS-WFC and WFPC2.
The Dartmouth Stellar Evolution Database is accessible through a website at
http://stellar.dartmouth.edu/~models/ where all tracks, isochrones, and
additional files can be downloaded.
