An optical ultrahigh-resolution cross-dispersed echelle spectrograph with adaptive optics

Jian Ge, J. R.P. Angel, B. Jacobsen, N. Woolf, R. Q. Fugate, J. H. Black, M. Lloyd-Hart

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


A prototype cross-dispersed optical echelle spectrograph of very high resolution has been designed and built at Steward Observatory and tested at the Starfire Optical Range 1.5 m telescope. It is the first spectrograph to take advantage of diffraction-limited images provided by adaptive optics in order to achieve a potential resolving power of R ∼ 600,000. The wavelength coverage in a single exposure is about 300 Å, which is approximately 100 times that of conventional spectrographs operating at comparable resolution. This was achieved by recording 60 cross-dispersed orders across the 18 × 18 mm2 area of the CCD detector. The total efficiency of the system, including the sky and telescope transmission, spectrograph, and CCD detector, is measured to be 1.3% at peak, much higher than that of other ultrahigh-resolution spectrographs. Sample stellar spectra with R ∼ 250,000 are presented.

Original languageEnglish (US)
Pages (from-to)879-891
Number of pages13
JournalPublications of the Astronomical Society of the Pacific
Issue number798
StatePublished - 2002

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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