HIRES: The High Resolution Echelle Spectrometer on the Keck Telescope

Details HIRES: The High Resolution Echelle Spectrometer on the Keck Telescope HIRES: The High Resolution Echelle Spectrometer on the Keck Telescope

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.1101v&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #11.01; Bulletin of the American Astronomical Society, Vol. 25, p.1305

Computer Science

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Scientific paper

We describe the high resolution echelle spectrometer (HIRES) now in operation on the Keck Telescope. HIRES, which is permanently located at a Nasmyth focus, is a standard in-plane echelle spectrometer with grating post dispersion. The collimated beam size is 12arcsec , and the echelle is a 1 times 3 mosaic, 12arcsec by 48arcsec in total size, of 52.6 gr/mm, R-2.6 echelles. The cross disperser is a 2 times 1 mosaic, 24arcsec by 16arcsec in size, of 250 gr/mm gratings, blazed at 7000{ Angstroms} in 1st order. The camera is of a unique new design: a large (30arcsec aperture) f/1.0, all spherical, all fused silica, catadioptric system with super-achromatic performance. It spans the entire chromatic range from 0.3mu to 2.0mu , delivering 12.6 micron (rms) images, averaged over all colors and field angles, without refocus. The detector is a thinned, backside-illuminated, Tektronix 2048(2) CCD with 24 micron pixels, which spans the spectral region from 0.3 mu to 1.1 mu with very high overall quantum efficiency. Typical limiting spectral resolution of HIRES is 67,000 with this CCD pixel size. Typical wavelength coverage per exposure is 3200--4500{ Angstroms} in the uv/blue, 4200--5400{ Angstroms} in the visible, and 5500--8000{ Angstroms} in the red/near-ir. Order separations are 8--21 arcseconds in the uv/blue, and 10--40 arcseconds in the visible/near-ir. The overall ``throughput'' (resolution times slit width) product achieved is 39,000 arcseconds. Peak overall efficiency for the spectrograph (not including telescope and slit losses) is 13% at 6000{ Angstroms} . As examples of HIRES performance, spectra of quasar absorption lines and of beryllium in metal poor stars will be shown.

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