A simple method to calibrate intensities of photographic slit spectrograms

Details A simple method to calibrate intensities of photographic slit spectrograms A simple method to calibrate intensities of photographic slit spectrograms

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..237v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 1, July 1985, p. 237-239. Research supported by the Universidad Catol

Astronomy and Astrophysics

Astrophysics

5

Calibrating, Photographic Plates, Spectrograms, Spectrophotography, Stellar Spectra, Focal Plane Devices, Spectrographs

Scientific paper

A wavelength-dependent intensity calibration of photographic spectrograms can be obtained through the spectrograph without any additional equipment beyond a simple neutral density filter of known transparency. This filter is introduced in the focal plane of the telescope covering part of the spectrograph slit. Exposure of the comparison lamps through the entire slit yields a calibration plate which shows a well defined density jump within each line. From the height of this jump (for many lines of widely ranging strengths) the characteristic curve can be derived. The method is described and compared to the classical calibration method with a tube sensitometer.

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