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Astron. Astrophys. Suppl. Ser.
Volume 118, Number 3, September 1996
Page(s) 595 - 603
Spectroscopy made easy: A new tool for fitting observations with synthetic spectra DOI: 10.1051/aas:1996222

Astronomy and Astrophysics Supplement Series, Vol. 118, September 1996, 595-603

Spectroscopy made easy: A new tool for fitting observations with synthetic spectra

J.A. Valenti and N. Piskunov

Send offprint requests to: J.A. Valenti

JILA, University of Colorado, Boulder, Colorado 80309--0440, U.S.A.
Astronomical Observatory of Uppsala University, Box 515, S--751 20 Uppsala, Sweden

Received November 22; accepted January 19, 1996


We describe a new software package that may be used to determine stellar and atomic parameters by matching observed spectra with synthetic spectra generated from parameterized atmospheres. A nonlinear least squares algorithm is used to solve for any subset of allowed parameters, which include atomic data ( and van der Waals damping constants), model atmosphere specifications ( , ), elemental abundances, and radial, turbulent, and rotational velocities. LTE synthesis software handles discontiguous spectral intervals and complex atomic blends. As a demonstration, we fit 26 FeI lines in the NSO Solar Atlas (Kurucz et al. 1984), determining various solar and atomic parameters.

Key words: radiative transfer --- methods: numerical --- techniques: spectroscopic --- stars: fundamental parameters --- sun: fundamental parameters --- atomic data

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