Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005acasn..46..406z&link_type=abstract
Acta Astronomica Sinica, vol. 46, no. 4, p. 404-415
Astronomy and Astrophysics
Astronomy
3
Methods: Data Analysis, Methods: Statistical, Stars: Fundamental Parameters, Pca, Non-Parameter Estimation, Window-Width
Scientific paper
The three fundamental parameters of stellar atmosphere, which are the effective temperature, the surface gravity, and the metallic abundance, determine the continuum and spectral lines in the stellar spectrum. A new algorithm is proposed for estimating the three parameters in this paper. It is composed of three steps: (1) the sample data of stellar spectrum, whose three fundamental parameters are known, is reduced to a lower dimensional feature space using PCA (Pnincipal Component Analysis) technique; (2) a non-parameter estimator with variable window-width is set up from the correspondence between the feature data and their fundamental parameters data; (3) this estimator is used to compute the fundamental parameters of a stellar spectrum. Experiments indicate that the estimator is more efficient and robust than the fixed window-width estimator.
Luo A.-Li
Wu Feng-Cheng
Zhang Jia-Ning
Zhao Yong-Heng
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