Open AccessAn Optical Ultrahigh‐Resolution Cross‐dispersed Echelle Spectrograph with Adaptive Optics
Author(s) -
Jian Ge,
J. R. P. Angel,
Bruce P. Jacobsen,
N. J. Woolf,
Robert Q. Fugate,
J. H. Black,
Michael LloydHart
Publication year - 2002
Publication title -
publications of the astronomical society of the pacific
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.294
H-Index - 172
eISSN - 1538-3873
pISSN - 0004-6280
DOI - 10.1086/341711
Subject(s) - spectrograph , physics , telescope , observatory , optics , adaptive optics , spectral resolution , detector , sky , resolution (logic) , spectral line , astrophysics , astronomy , computer science , artificial intelligence
A prototype cross-dispersed optical echelle spectrograph of very highresolution has been designed and built at Steward Observatory and tested at theStarfire Optical Range (SOR) 1.5 m telescope. It is the first spectrograph totake advantage of diffraction-limited images provided by adaptive optics inorder to achieve a potential resolving power of $R \sim 600,000$. Thewavelength coverage in a single exposure is about 300 \AA, which isapproximately 100 times that of conventional spectrographs operating atcomparable resolution. This was achieved by recording 60 cross-dispersed ordersacross the $18\times 18$ mm$^2$ area of the CCD detector. The total efficiencyof the system, including the sky and telescope transmission, spectrograph andCCD detector, is measured to be 1.3% at peak, much higher than that of otherultra-high-resolution spectrographs. Sample stellar spectra with $R \sim250,000$ are presented.Comment: 29 pages, 12 figures, 2 tables, accepted for publication in PASP August issu
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