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Spectral Classification of B and A Stars from the Line Features of S2/68 Spectra

Published online by Cambridge University Press:  30 March 2016

A. Cucchiaro ,
M. Jaschek  and
C. Jaschek
A. Cucchiaro
Affiliation:
Institut d’Astrophysique, Liège, Belgium
M. Jaschek
Affiliation:
Observatoire de Strasbourg, France
C. Jaschek
Affiliation:
Observatoire de Strasbourg, France

Extract

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The experiment S2/68 has supplied a large number of ear type spectra in the wavelength region 1350–2730 A. The resolution is 37 A, which is about equivalent to a reciprocal dispersion of 1850 A/mm. We had at our disposal about one thousand spectra of stars brighter than 6m5.

The availability of such material has lead us to establish a spectral classification system based only upon features visible in the spectrum. A second step was to compare this system to the MK classifications.

It turned out to be easy to establish a temperature sequence based upon convenient intensity ratios of line features and somewhat more difficult to establish luminosity criteria. Among the B type stars it is possible to distinguish main sequence objects, supergiants and intermediate objects.

Type
Joint Dicussions
Information
Highlights of Astronomy , Volume 4 , Issue 2: Highlights of Astronomy. As presented at the XVIth General Assembly of the IAU, 1976 (Part II) , 1977 , pp. 303
Copyright
Copyright © Reidel 1977