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High Dispersion Spectra of CP Stars: A Problem in Classification

Published online by Cambridge University Press:  12 April 2016

C. R. Cowley
C. R. Cowley*
Affiliation:
Dominion Astrophysical Observatory and University of Michigan

Abstract

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High dispersion (2.4 Å mm−1) spectra of chemically peculiar late B and A stars reveal a wealth of information. In this paper we attempt to organize this material by introducing a classification scheme based on the second spectra of the lanthanide rare earths. Four categories are introduced: a) Lanthanide Rich, b) Nd-Sm Anomalous, c) Iron Group-Rich, Rare Earth Moderate, and d) Lanthanide Normal. The variability that is possible in different stellar spectra of Nd II and/or Sm II relative to Ce II, Eu II, and Gd II is a prominent feature of the data. Thus far, the only means of detecting these variations is to use high dispersion spectra. The relationship between our classification and low dispersion spectroscopic and photometric criteria is a problem for the future.

Type
VII Theoretically and Empirically Oriented Approach to Spectral Classification
Information
International Astronomical Union Colloquium , Volume 47: Spectral Classification of the Future , 1979 , pp. 375 - 388
Copyright
Copyright © Vatican Observatory 1979

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