Spectral Classification; Old and Contemporary

Abstract

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.

To be published in "Principles and Perspectives in Cosmochemistry" Lecture Notes on Kodai School on Synthesis of Elements in Stars: Ed Aruna Goswami & Eswar Reddy, Springer Verlag, 2009, 17 pages, 10 figures

References in corpus (5)

• Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
• The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
• The Spectrum of the Brown Dwarf Gliese 229B
• Automated Classification of Stellar Spectra. II: Two-Dimensional Classification with Neural Networks and Principal Components Analysis
• The INT Search for Metal-Poor Stars. Spectroscopic Observations and Classification via Artificial Neural Networks