Summary
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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Giridhar, S. (2010). Spectral Classification: Old and Contemporary. In: Goswami, A., Reddy, B. (eds) Principles and Perspectives in Cosmochemistry. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10352-0_3
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DOI: https://doi.org/10.1007/978-3-642-10352-0_3
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