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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20190116T120000
DTEND;TZID=Atlantic/Canary:20190116T130000
UID:iactalks-1238
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1238
CREATED:2019-01-16T12:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:HORuS: High-Resolution and Broad Spectral Coverage on GTC
DESCRIPTION:HORuS: High-Resolution and Broad Spectral Coverage on GTC\nDr. 
 Carlos Allende\n\nThe High Optical Resolution Spectrograph (HORuS), is now
  ready for operation on Gran Telescopio Canarias (GTC). HORuS is mainly a 
 recyled instrument, largely based on components from UES, which was availa
 ble at the WHT in the 90's. HORuS offers single-object R=25,000 spectrosco
 py with broad spectral coverage (380-700 nm, with gaps in the red). A 3x3 
 integral field unit (IFU) covering 4.4 arcsec2 gathers the light on the fo
 cal plane into optical fibers that later align to form a pseudo-slit at th
 e entrance of the spectrograph.The science fibers can be illuminated with 
 light from calibration lamps. On the detector, with the IFU acting as an i
 mage slicer, monochromatic light spreads over hundreds of pixels, enabling
  the possibility of achieving, for very bright targets, signal-to-noise ra
 tios per resolution element of several thousand in a single exposure. For 
 fainter targets (12<V<16), readout noise is minimized by on-chip bin
 ning 8 (spatial) x 2 (spectral). From direct comparison of spectra of the 
 same targets, the combined efficiency of HORuS+GTC is about 40% lower than
  UVES+VLT. For a V=7 star, the signal-to-noise per resolution element in a
  900-seconds integration is about 1500 at 525 nm.
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