Classification of Stellar Spectra with LLE

Details Classification of Stellar Spectra with LLE Classification of Stellar Spectra with LLE

2011-10-20

arxiv.org/abs/1110.4646v1

The Astronomical Journal, 142 (2011) 203

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

15 pages, 13 figures; accepted for publication in The Astronomical Journal

Scientific paper

10.1088/0004-6256/142/6/203

We investigate the use of dimensionality reduction techniques for the classification of stellar spectra selected from the SDSS. Using local linear embedding (LLE), a technique that preserves the local (and possibly non-linear) structure within high dimensional data sets, we show that the majority of stellar spectra can be represented as a one dimensional sequence within a three dimensional space. The position along this sequence is highly correlated with spectral temperature. Deviations from this "stellar locus" are indicative of spectra with strong emission lines (including misclassified galaxies) or broad absorption lines (e.g. Carbon stars). Based on this analysis, we propose a hierarchical classification scheme using LLE that progressively identifies and classifies stellar spectra in a manner that requires no feature extraction and that can reproduce the classic MK classifications to an accuracy of one type.

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