Cluster analysis of rare earths in stellar spectra

Details Cluster analysis of rare earths in stellar spectra Cluster analysis of rare earths in stellar spectra

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983esasp.201..153c&link_type=abstract

Statistical Methods in Astronomy, Proceedings on an International Colloquium held at Strasbourg, France, 12-16 September, 1983.

Astronomy and Astrophysics

Astronomy

3

Scientific paper

A cluster analysis is performed using parameters from Wavelength Coincidence Statistics (WCS) of stars with lines of the second spectra of lanthanide rare earths. Certain magnetic Ap stars with palpably atypical spectral patterns are well separated in parameter space from the other clusters, as would be expected. It is shown that the rare-earth patterns in some of the magnetic Ap stars are more closely related to those of Am stars than to their magnetic congeners. More surprising is the similarity of WCS parameters of normal and peculiar late-type stars to those of some CP stars. A viable working hypothesis is that these objects cluster closely because the abundance patterns are similar. This should not be dismissed as a coincidence.

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