The BaSeL Stellar Libraries

The BaSeL stellar spectral energy distribution (SED) libraries are libraries of stellar SEDs used for a variety of applications, such as evolutionary population synthesis.
The project was inititiated and led by Prof. Dr. phil. Roland Buser from the University of Basel, Switzerland.
They consist of theoretical stellar SEDs recalibrated using empirical photometric data. Therefore, we call them semi-empirical libraries. They cover a wide range of stellar parameters and are widely used for a variety of applications, such as evolutionary population synthesis.

There are two versions currently in use:
The BaSeL 2.2 library (Lejeune, Cuisiner, and Buser, 1998 A&AS, 130, 65) which was calibrated using photometric data from solar metallicity stars.
The BaSeL 2.2 library can be downloaded here.

The BaSeL 3.1 library (Westera, Lejeune, Buser, Cuisinier, and Bruzual A., 2002 A&A, 381, 524) was calibrated metallicity-dependently using photometric data from globular clusters.
The BaSeL 3.1 library can be downloaded here.

The libraries can also be retrieved via public ftp from the University of Basel: https://astro.unibas.ch/BaSeL_corr.html.

Funding: Swiss National Science Foundation SNSF