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Quantitative Two-Dimensional Classifications of Low Dispersion Objective Prism Spectra

Published online by Cambridge University Press:  14 August 2015

Th. Schmidt-Kaler
Th. Schmidt-Kaler*
Affiliation:
Astronomisches Institut Bochum

Extract

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The objective prism (or grating) is the most efficient stellar spectrograph since it suffers no light losses at a slit and - compared to a slit spectrograph - only small losses in the camera optics. However, objective prism spectra have two principal disadvantages:

  1. (1) the spectral resolution (and consequently the sharpness of spectral features) depends on the seeing, which may vary from plate to plate.

  2. (2) quantitative measurements are difficult because of the difficulty in obtaining an exact photographic calibration; no comparison spectrum can be placed near the stellar spectra.

Type
Part I: Fundamentals of the HR Diagram
Information
Symposium - International Astronomical Union , Volume 80: The HR Diagram , 1978 , pp. 29 - 32
Copyright
Copyright © Reidel 1978 

References

Schmidt-Kaler, Th., Diaz-Santanilla, G., Rudolph, R. and Unger, H. (1976). Quantitative Klassifikation von Sternspektren mittels Objektivprismenaufnahmen. Forschungsberichte des Landes Nordrhein-Westfalen Nr. 2595, Westdeutscher Verlag, Opladen.Google Scholar