GRAMS Models

GRAMS is a Grid of RSG and AGB Models generated using the radiative transfer code 2Dust.

GRAMS consists of two subsets of models - one each for oxygen-rich (silicate) and carbonaceous dust - constructed around model photospheres computed by Kučinskas et al. (2005 , 2006) for O-rich stars, and by Aringer et al. (2009, models can be downloaded here) for carbon stars.

The grid samples a large range of stellar and dust shell parameters relevant to red supergiant (RSG) and asymptotic giant branch (AGB) stars, using a fixed set of dust properties that were determined in Sargent et al. (2010, silicate dust) and Srinivasan et al. (2010, carbonaceous dust).

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.

Please cite the GRAMS papers (Sargent et al. 2011 and Srinivasan et al. 2011) if you use the models.

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The models and related documentation can be downloaded as a gzipped tar file (grams.tar.gz). The enclosed subfolder named documentation contains a README file which explains how to install and use the grid. It also contains some information related to the grid. For a detailed description of the models, please consult the GRAMS papers cited above. If you don't receive an email for the grams.edu mailing list, you may subscribe yourself by sending email to the majordomo.