On the use of a focal-reducer system for slitless field spectroscopy

Details On the use of a focal-reducer system for slitless field spectroscopy On the use of a focal-reducer system for slitless field spectroscopy

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....80..248g&link_type=abstract

Astronomy and Astrophysics, vol. 80, no. 2, Dec. 1979, p. 248-251. Deutsche Forschungsgemeinschaft

Physics

Optics

13

Astronomical Spectroscopy, Cassegrain Optics, Gratings (Spectra), Prisms, Radial Velocity, Telescopes, Astrometry, Instrument Errors, Spectral Resolution, Velocity Errors, Velocity Measurement, Wave Dispersion

Scientific paper

A slitless field-spectrograph for Cassegrain telescopes has been designed. It is based on the focal-reducer optical arrangement and grating prisms. With the 'multiple diaphragm method' not only a gain in limiting magnitude of 3-4 mag has been achieved, but also other drawbacks of the classical objective prism camera such as low spectral resolution and the overlapping of spectra in crowded fields are avoided. Radial velocity measurements by the Pickering-Fehrenbach reversion method can be carried out with an accuracy of about plus or minus 13 km/s per single plate, and a dispersion of 290 A/mm.

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