Make Me A Star!
Welcome to the MMAS Homepage
Make Me A Star (MMAS) is a software package for quickly
generating stellar collision remnants. This software
could be used in combination with realistic dynamical simulations
of star clusters that include stellar
collisions. MMAS is already being incorporated into two software
that respectively treat encounters between two stars and among three stars.
These packages are controlled through a web interface and treat the orbital trajectories,
possible merger(s), and evolution of the merger product.
primary code developers of MMAS are James Lombardi and Jessica Sawyer
Warren. This code is free software licensed
If you use this package for
work that is to be published, we ask that you inform us, acknowledge
use of the package, and cite the following articles:
The details of the algorithms used in this package are described in
the second article above.
"Collisions of Main-Sequence Stars and the Formation of Blue
Stragglers in Globular Clusters." Lombardi, Rasio, and Shapiro 1996,
Astrophysical Journal, 468, 797; scanned (ADS),
Collisions and the Interior Structure of Blue Stragglers." Lombardi, Warren, Rasio, Sills, and Warren 2002, Astrophysical Journal, 568, 939;
Lombardi, Thrall, Deneva, Fleming, and Grabowski 2003,
Monthly Notices of the Royal Astronomical Society, 345, 762-780;
To download MMAS, simply click on the following link.
To unpack this file, issue the either of the following commands from the command
tar xzvf mmas1.6.tar.gz
gunzip -c mmas1.6.tar.gz | tar xvf -
This will create a directory named mmas1.6 that contains the software
package, as well as a sample driver program and sample input files.
The README file in this directory discusses the package in more
detail. But for a quick start, type the following commands:
For an even faster start, the last command can be replaced with
./meastar < sample_input
Version 1.6 is used for our 2003 MNRAS article: it implements a
Fehlberg fourth-fifth order Runge-Kutta
method to integrate the structure of the collision product, and the
default value of the fitted parameter c_3 is fine-tuned to -1.0.
uses a mesh spacing curve to ensure that the shells are always finely spaced
in both the core and the outer layers of the collision product.
Version 1.4 permits the more massive star to be entered second. Version 1.3
treats the outermost layers of the remnant more accurately.
Version 1.2 is the first "standard" version that was used for all the
calculations in our 2002 ApJ paper. Version 1.1 was used for the
preprint for this paper, and included a different set of callibration
To download an earlier, currently unsupported, version of MMAS, click below.
The README file contains a more detailed description of the changes made in each version.
A number of indivuduals have given helpful feedback or contributions to MMAS. We are particularly grateful to Josh Faber, Onno Pols, Peter Teuben, and Ashley Thrall.
This work was supported by the Keck Northeast Astronomy Consortium
and by Research Corporation.
work was also partially supported by the National Computational
Science Alliance under Grant AST980014N and utilized the NCSA
SGI/Cray Origin2000 parallel supercomputer.
This material is based upon work supported by the National Science Foundation under Grants No. AST-0071165 and AST-0205991 at Vassar, as well as under Grant Nos. 9618116 and 0070918 at MIT. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
Please send any comments or suggestions to