Interactive spectral analyzer and comparator (ISAAC)

Details Interactive spectral analyzer and comparator (ISAAC) Interactive spectral analyzer and comparator (ISAAC)

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pobeo..75...89l&link_type=abstract

Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 75, p. 89 - 92 (2003). In: Proceedings of the XII

Physics

1

Physics Of Stars, Stellar Systems, Synthetic Spectra

Scientific paper

We are developing an application for graphical comparison of observed and synthetic spectra (ISAAC). Synthetic spectrum calculation is performed by SPECTRUM, Stellar Spectral Synthesis Program by Richard O. Gray that we use with his kind permission. This program computes line profiles under LTE conditions in the given wavelength interval using a stellar (solar) atmosphere model, a spectral line data list (wavelength, energy levels, oscillator strengths, and damping constants), a file containing data for atoms and molecules, as well as a data file for hydrogen line profiles calculation. ISAAC offers a simple interface for viewing and changing any atomic parameter SPECTRUM uses for line profile calculation, enabling quick comparison of the new synthetic line profile with the observed one. In this way parameters like relative abundances, oscillator strengths and van der Waals damping constants can be improved, achieving a better agreement with the observed spectrum.

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