Fitting of dust spectra with genetic algorithms. I. Perspectives and limitations
- Author(s)
- Angela Baier, Franz Kerschbaum, Thomas Lebzelter
- Abstract
Aims: We present an automatised fitting procedure for the IR range of AGB star spectra. Furthermore we explore the possibilities and boundaries of this method.
Methods: We combine the radiative transfer code DUSTY with the genetic algorithm PIKAIA in order to improve an existing spectral fit significantly.
Results: In order to test the routine we carried out a performance test by feeding an artificially generated input spectrum into the program. Indeed the routine performed as expected, so, as a more realistic test set-up, we tried to create model fits for ISO spectra of selected AGB stars. Here we were not only able to improve existing fits, but also to show that a slightly altered dust composition may give a better fit for some objects.
Conclusions: The use of a genetic algorithm in order to automatise the process of fitting stellar spectra seems to be very promising. We were able to improve existing fits and further offer a quantitative method to compare different models with each other. Nevertheless this method still needs to be studied and tested in more detail.- Organisation(s)
- Department of Astrophysics
- Journal
- Astronomy & Astrophysics
- Volume
- 516
- No. of pages
- 9
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361/200913968
- Publication date
- 06-2010
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy, 103004 Astrophysics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/7aad7126-6981-4358-9af8-88b2063e353f