Physics – Optics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20115106c&link_type=abstract
American Astronomical Society Meeting 201, #151.06; Bulletin of the American Astronomical Society, Vol. 35, p.577
Physics
Optics
Scientific paper
The Bench Spectrograph at the University of Virginia's Fan Mountain Observatory is being built for use on the facility's primary research telescope, the 1-meter astrometric reflector. The spectrograph is intended for initial use as a dedicated instrument to collect moderate-resolution (10 km s-1) spectra of candidate K giant stars for the Grid Giant Star Survey (GGSS), which is a program to identify stars for the Astrometric Grid of NASA's Space Interferometry Mission (SIM). Because the GGSS candidate sample is extensive, bright (V<13), and uniformly distributed over the sky, a fiber-fed design was selected to provide maximal spectral stability and uniformity while minimally affecting observing efficiency. Spectra will be used primarily for luminosity classification, abundance analysis, and radial velocity measurement. The spectrograph is a single-object, fiber-fed design built largely from off-the-shelf components at modest cost. The primary optics are transmissive, and a 1200 line/mm reflectance grating is used to provide a resolving power of R ˜ 2000 at λ ˜ 500 nm. Although the primary wavelength region of interest for the GGSS is 480-680 nm, the spectrograph will be usable throughout the optical spectrum. Even with the combination of a modest telescope aperture and the relatively low throughput characteristic of fiber-fed systems, we expect the spectrograph to be useful for medium resolution spectroscopy of stars as faint as V ˜ 14.
Crane Jeffrey D.
Majewski Steven R.
Patterson John R.
Skrutskie Michael F.
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