Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasp..112..801k&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 112, Issue 772, pp. 801-808.
Astronomy and Astrophysics
Astronomy
Instrumentation: Spectrographs, Techniques: Spectroscopic
Scientific paper
A spectroscopic imager was designed and constructed to provide a new capability for measuring the spectrum of the sky across wide fields of view. The instrument uses a high-speed optical system to form an image on the entrance slit of a matching stigmatic spectrograph, which then disperses a spectrum of a strip of the sky onto a charge-coupled device (CCD). A separate direct imaging system controls pointing and tracking, and both instruments share in tandem a computer-controlled mounting which permits automated data acquisition. The demonstrated optical performance is a 4 Å×11'' single-pixel resolution in a 4000 Å×3.2d field. Absolute calibration on Vega gives a response at 6563 Å that is 7 times the CCD readout noise at an integrated exposure of 1 photon cm-2 Å-1. Sample airglow, nebular, stellar, and cometary spectra illustrate the detection of extended emission features with fluxes from 5 to 2000 R. A measurement of zenith brightness for Na and Hg emission lines from urban artificial lighting is tabulated.
Graham Pamela M.
Kielkopf John F.
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