Calibration of spectrograms using a Lyot filter element

Details Calibration of spectrograms using a Lyot filter element Calibration of spectrograms using a Lyot filter element

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..131t&link_type=abstract

Astronomy and Astrophysics, vol. 63, no. 1-2, Feb. 1978, p. 131-136. Research supported by the Max-Planck-Gesellschaft.

Astronomy and Astrophysics

Astrophysics

29

Astronomical Spectroscopy, Calibrating, Optical Filters, Stellar Spectrophotometry, Astronomical Photography, Error Analysis, H Gamma Line, Instrument Errors, Spectral Line Width, Stellar Spectra

Scientific paper

A calibration technique for photographic spectrograms, based on the spectral modulation imposed on a continuum light source by a Lyot filter element, is presented. The technique requires less space on spectrum plates than conventional methods, which makes it especially useful for Coude spectrographs. Tests of a device employing the calibration technique show that it provides a greater accuracy in determining relative intensities than the step-filter method; when the calibration device is adopted for the measurement of equivalent widths of H-gamma for standard stars, the results prove to be in good agreement with published data.

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