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Two Dimensional Spectral Classification of Early Type Stars by Low Dispersion Spectrophotometry

Published online by Cambridge University Press:  14 August 2015

A. Gutiérrez-Moreno  and
H. Moreno
A. Gutiérrez-Moreno
Affiliation:
Departamento de Astronomía, Universidad de Chile
H. Moreno
Affiliation:
Departamento de Astronomía, Universidad de Chile

Abstract

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Spectrophotometric data of early type stars (spectral intensity distributions from 3100 to 6000 Å and equivalent widths of Hβ, Hγ and Hδ) have been analysed, looking for the best parameters for a two dimensional spectral classification. It was found that the best correlation with MK classification is given by the equivalent width of Hβ and the Balmer discontinuity.

The classification scheme is well defined for stars from B0 to A1 of luminosity classes V to III. No stars of luminosity class II were observed. Luminosity class I is clearly separated from the less luminous stars, but the number of supergiants observed is too small to give a clear separation of spectral types.

Type
Part III: Photometric Classification
Information
Symposium - International Astronomical Union , Volume 50: Spectral Classification and Multicolour Photometry , 1973 , pp. 258 - 266
Copyright
Copyright © Reidel 1973 

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