The Upgraded Fiber Optic Echelle Spectrograph

Details The Upgraded Fiber Optic Echelle Spectrograph The Upgraded Fiber Optic Echelle Spectrograph

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.4207h&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #42.07; Bulletin of the American Astronomical Society, Vol. 28, p.1324

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The Upgraded Fiber Optic Echelle (UFOE) is a fiber-fed, white pupil echelle spectrograph to be implemented at the Hobby-Eberly Telescope (HET) in the spring of 1997. It will serve as the commissioning spectrograph until HET facility instruments come on line in early 1998. This instrument is a quick, cost effective upgrade of the Fiber Optic Echelle, resident at KPNO for a decade. The UFOE will be capable of R = 13,900 (Nyquist limited 2 pixels/resel), with complete spectral coverage from 530 nm to 850 nm and about 90% coverage to 900 nm with adequate order separation. It utilizes a 2.5 meter radius 400 mm diameter spherical mirror to reimage an ``average'' pupil between the echelle and the cross-dispersing grating onto the entrance pupil of a 200 mm f/2 camera lens. Due to the reduction of vignetting made possible with the pupil mirror, it is estimated that the UFOE will have an efficiency of 13% on the sky when used on the HET, whereas the FOE had an efficiency of 8%. This efficiency, combined with the 9 meter aperture of the HET, should allow a limiting magnitude of V = 18.9 for a 3000 second exposure with S/N = 30 per 1/2 resel. This spectrograph has been designed and constructed at Penn State and we present results of characterization of image quality, vignetting, and focal plane characteristics.

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