Astron. Astrophys. Suppl. Ser.
Volume 118, Number 3, September 1996
|Page(s)||595 - 603|
|Published online||15 September 1996|
Spectroscopy made easy: A new tool for fitting observations with synthetic spectra
JILA, University of Colorado, Boulder, Colorado 80309–0440, U.S.A.
2 Astronomical Observatory of Uppsala University, Box 515, S–751 20 Uppsala, Sweden
Send offprint request to: J.A. Valenti
Accepted: 19 January 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
© European Southern Observatory (ESO), 1996