Spectral Classification; Old and Contemporary

Details Spectral Classification; Old and Contemporary Spectral Classification; Old and Contemporary

2010-03-21

arxiv.org/abs/1003.4002v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

To be published in "Principles and Perspectives in Cosmochemistry" Lecture Notes on Kodai School on Synthesis of Elements in S

Scientific paper

Beginning with a historical account of the spectral classification, its refinement through additional criteria is presented. The line strengths and ratios used in two dimensional classifications of each spectral class are described. A parallel classification scheme for metal-poor stars and the standards used for classification are presented. The extension of spectral classification beyond M to L and T and spectroscopic classification criteria relevant to these classes are described. Contemporary methods of classifications based upon different automated approaches are introduced.

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