Determination of the Mass Loss Rate and the Terminal Velocity of Stellar Winds. I. Genetic Algorithm for Automatic Line Profile Fitting
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| Format: | Artículo científico |
| Langue: | en |
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Universidad Nacional Autónoma de México
2005
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| _version_ | 1876455965755179008 |
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| author | L. Georgiev |
| author_facet | L. Georgiev |
| contents | Determination of the Mass Loss Rate and the Terminal Velocity of Stellar Winds. I. Genetic Algorithm for Automatic Line Profile Fitting L. Georgiev X. Hernández Física, Astronomía y Matemáticas OUTFLOWS STARS:WINDS LINE: PROFILES STARS: ATMOSPHERES A new method for automatic fitting of P Cyg line profiles in UV spectra ofstellar winds is presented. The line source function is calculated using Sobolev`sapproximation and the emergent flux is obtained by exact integration of the equation of the radiation transport (similar to the SEI method described by Lamerset al. (1987)). The quality of the fit is evaluated using the likelihood estimator.The maximization of the likelihood is done by a genetic algorithm. The advantagesof our method with respect to other similar approaches are its robustness and itsinsensibility to the initial guess. In addition, the algorithm guarantees the localization of the global maximum of the likelihood hypersurface, which is not the casefor classical minimization algorithms. Here we present an implementation of thegenetic algorithm for line profile fitting, its tests on both synthetic and real dataand an estimation of the confidence limits of the results. 2005 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57141114 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.41 |
| format | Artículo científico |
| id | redalyc_57141114 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Determination of the Mass Loss Rate and the Terminal Velocity of Stellar Winds. I. Genetic Algorithm for Automatic Line Profile Fitting L. Georgiev Física, Astronomía y Matemáticas OUTFLOWS STARS:WINDS LINE: PROFILES STARS: ATMOSPHERES Determination of the Mass Loss Rate and the Terminal Velocity of Stellar Winds. I. Genetic Algorithm for Automatic Line Profile Fitting L. Georgiev X. Hernández Física, Astronomía y Matemáticas OUTFLOWS STARS:WINDS LINE: PROFILES STARS: ATMOSPHERES A new method for automatic fitting of P Cyg line profiles in UV spectra ofstellar winds is presented. The line source function is calculated using Sobolev`sapproximation and the emergent flux is obtained by exact integration of the equation of the radiation transport (similar to the SEI method described by Lamerset al. (1987)). The quality of the fit is evaluated using the likelihood estimator.The maximization of the likelihood is done by a genetic algorithm. The advantagesof our method with respect to other similar approaches are its robustness and itsinsensibility to the initial guess. In addition, the algorithm guarantees the localization of the global maximum of the likelihood hypersurface, which is not the casefor classical minimization algorithms. Here we present an implementation of thegenetic algorithm for line profile fitting, its tests on both synthetic and real dataand an estimation of the confidence limits of the results. 2005 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57141114 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.1 Vol.41 |
| title | Determination of the Mass Loss Rate and the Terminal Velocity of Stellar Winds. I. Genetic Algorithm for Automatic Line Profile Fitting |
| topic | Física, Astronomía y Matemáticas OUTFLOWS STARS:WINDS LINE: PROFILES STARS: ATMOSPHERES |
| url | https://www.redalyc.org/articulo.oa?id=57141114 |