Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.120..223h&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 120, no. 2, March 1986, p. 223-237.
Astronomy and Astrophysics
Astrophysics
6
Classifications, Stellar Spectra, Ultraviolet Spectra, Cluster Analysis, Interstellar Extinction, Iue, Line Spectra, Principal Components Analysis, Statistical Analysis
Scientific paper
A new spectral classification system specific to the UV was applied to a set of stellar low-dispersion International Ultraviolet Explorer spectra. A statistical methodology working in a multidimensional parametric space was employed, using an asymmetry coefficient describing the continuum shape, and empirically corrected for the interstellar reddening and the intensities of sixty objectively selected lines. Spectral variables were weighted relative to the asymmetry coefficient which varies with a particular star. The statistical algorithm consisted of both a principal-component analysis and a cluster analysis. With respect to this new UV classification system, the groups constructed by cluster analysis exhibited good homogeneity and discrimination for spectral types and luminosity classes.
Egret Daniel
Heck Andre
Nobelis Ph.
Turlot J. C.
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