Resolution echelle spectrographs

We have observed three subgiants HD 23249 (KO), HD 198149 (KO), HD 222404 (Kl) and three dwarfs HD 10780 (KO), HD 4628 (K2), HD 201091 (K5), on 2002 November 28 and 29, with the high-resolution cross-dispersed echelle spectrograph SOFIN, mounted on the Nordic Optical Telescope (NOT). They are in the solar neighbourhood (< 15 pc), are very bright (V < 6) and have modest projected rotational velocities (v sin i < 4 km s 1) to limit blends between spectral lines. They also do not present any evidence for emission (or a moderate one, as in the case of the three dwarfs) in the core of Ca II H and K lines. 

The VLT, centrepiece of the ESO, promises an exceptional harvest of astronomical data. Understanding the chemical evolution of the Universe requires a coordinated study of the most remote objects, ancient stars in the galactic halo and absorbent clouds in the line of sight of quasars. To this end, the high-resolution spectrograph UVES (Ultraviolet Echelle Spectrograph) was set at one focus of Kueyen, one of the four components of the VLT, perched at the top... 

Figure 8.44. Spectrum of cyclohexane obtained with an echelle spectrograph and one CCD exposure. Magnified spectrum demonstrates high spectral resolution. (Adapted from Reference 35 with permission.)...

Molybdenum target. X-ray, 304,311 Momentum, angular, in NMR, 499 Monochromatic radiation Beer law, 158 diode lasers, 173 incoherent, 169 Monochromator, 180-189 dispersion, 185 echelle spectrograph, 261 effect of slit width on resolution. 188... 

Abstract. Lrshell, a mid-infirared echelle spectrograph developed through a collaboration between the University of Texas, the University of California Space Sciences Laboratory, and Hughes Aircraft, has been in regular use for astronomical observations for about hve years. It is optimized for high spectral resolution (R 10,000) observations of narrow spectral regions (AA/A 1/300) and compact sources (a few arcsec), and is sensitive in... 

Abstract. We present observations of the molecular outflow sources S106 and GL 2591. The IRTF Cryogenic Echelle Spectrograph (CSHELL) was used to acquire long-slit HI Br 7 and Ha S(l) 1-0 spectra with I. O spatial and 14 km sec spectral resolution. These data show the outflows to be both spatially and spectrally resolved, with distinct emissions from the YSOs and the extended flows. We interpret the kinematics and spatial variations in terms of the outflows central exciting sources and their surrounding environments. 

The NASA Infrared Telescope Facility Cryogenic Echelle Spectrograph (CSHELL see Greene et al. 1993) is a new near-infrared instrument which h2is adequate sensitivity, spatial, and spectral resolution to advance our observational knowledge of the morphologies and kinematics of outflows. 

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