Astronomical spectrophotometry using a cooled, intensified, silicon vidicon detector

Astronomy and Astrophysics – Astronomy

Scientific paper

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Image Intensifiers, Photodiodes, Stellar Spectrophotometry, Telescopes, Vidicons, Calibrating, Cooling Systems, Gratings (Spectra), Signal To Noise Ratios, Silicon Junctions

Scientific paper

The performance and astronomical calibrations of a cooled intensified silicon vidicon detector are described. The spectrometer comprises a standard grating, classification dispersion spectrograph (22.4 nm/mm in the first order, 11.2 nm/mm in the second order). Measurements of differential extinction have been obtained from observations of the spectrophotometric standard HR 4295 (mv = 2.37, A1V). Astronomical observations using a 60-cm telescope indicate that the spectra of 12.5 magnitude stars may be obtained with an S/N of 10 with a one-hour integration. After corrections for differential extinction and instrumental response, the agreement between derived and published relative intensities is 3 percent.

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