A fiber-fed echelle spectrograph for the hale 5-m telescope

Details A fiber-fed echelle spectrograph for the hale 5-m telescope A fiber-fed echelle spectrograph for the hale 5-m telescope

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasp..107...62l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 107, no. 707, p. 62-67

Astronomy and Astrophysics

Astronomy

10

Echelle Gratings, Refracting Telescopes, Spectral Resolution, Spectrographs, Visible Spectrum, Charge Coupled Devices, Helioseismology, Solar Interior, Stellar Oscillations

Scientific paper

We describe a new fiber-fed echelle spectrograph which is now in operation on the Hale 5-m telescope at Palomar Observatory. The instrument is optimized for high spectral stability, necessary for asteroseismology measurements of small periodic variations in stellar radial velocities. It features a 7-element all-spherical 610-mm focal length f/3.0 lens system and prism cross disperser in a compact double-pass quasi-Littrow configuration. Light enters the system at prime focus, and is channeled to the spectrograph by a fiber-optic cable. The instrument rests on a fixed-orientation optical bench inside the telescope's East Arm. It can be operated in a low-resolution mode, with resolution R = 20,000 and overall efficiency (including atmospheric seeing) e approximately equal to 550 nm, or a high-resolution mode, with R = 40,000 and e approximately equal to 1.5 percent at 550 nm; both modes have Rpixel = 100,000. With a large-format CCD detector (2048 X 2048 with 27 micrometer pixels), the entire visible spectrum from 400-1000 nm can be recorded in two exposures, with no gaps. We have also incorporated a novel imaging system to produce a circularly symmetric guide image of the input fiber tip. Using a fiber-optic double scrambler, the instrument produces radial-velocity measurements which are stable at approximately the m/s level over short (less than or approximately equal to 30 min) time periods.

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