A single ETALON Fabry-Perot spectrometer for observations of nebulae at visible and infrared wavelengths

Astronomy and Astrophysics – Astronomy

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Astronomical Spectroscopy, Fabry-Perot Spectrometers, Nebulae, Infrared Astronomy, Optical Paths, Piezoelectricity, Spectral Resolution, Visible Spectrum

Scientific paper

Two Fabry-Perot spectrometers which have been used to study the emission spectra of nebulae at 0.6 and 2.1 microns are described. Both instruments use a single piezoelectrically scanned etalon at the Cassegrain focus of the telescope. The spectral resolution of both instruments is about 15 km/sec. The maximum fields of view of the optical and IR spectrometers on the Leuschner Observatory 0.76-m telescope are 2 and 1.5 arcmin, respectively, and the noise equivalent radiances are 4.2 x 10 to the -7th and 0.00012 erg/sq cm per sec per ster, respectively. The problems of etalon drift, data collection, and wavelength calibration are discussed.

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