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GRAMS Models

GRAMS is a [G]rid of [R]SG and [A]GB [M]odel[s] generated using the radiative transfer code 2Dust.


The grid samples a large range of stellar and dust shell parameters relevant to red supergiant (RSG) and asymptotic giant branch (AGB) stars. The models consider both oxygen-rich (O-rich) and carbon-rich (C-rich) dust, as described in Sargent et al. (2010) and Srinivasan et al. (2010) respectively.

GRAMS is intended for fitting large sets of photometric data for RSG/AGB candidates in order to quickly determine their luminosities and dust mass-loss rates without the need for detailed modeling. It can therefore be used to investigate the total dust injection rate from evolved star samples to the interstellar medium (ISM) of a galaxy.



The current GRAMS models can be dowloaded from our ftp site:

ftp GRAMS


or from here: i

Grams Models

When you download this data, could you please send an email to Ben Sargent (sargent <at> stsci.edu) and Sundar Srinivasan (srinivas <at> iap.fr), so that we may notify you of updates to these models? The file you should download is named grams.tar.gz, and when it downloads, you should un-tar and un-gzip it. After so doing, you will notice a very descriptive README.pdf file, which describes how to use the files in the package. See Sargent et al (2011, ApJ, 728, 93) concerning the O-rich models, and see Srinivasan et al (2011, A&A, 532, 54) concerning the C-rich models.





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