UVES The Ultraviolet Visible Echelle Spectrograph John Pritchard

UVES The Ultraviolet & Visible Echelle Spectrograph John Pritchard ESO p 2 pp 3 Workshop: UVES Overview | 12. 01. 2012 | John Pritchard

UVES The Ultraviolet & Visible Echelle Spectrograph Overview • 2 nd oldest instrument on the VLT (commissioned 1999), but still one of the most demanded • Cross-dispersed Echelle spectrograph • Nasmyth Platform B of VLT UT 2 (Kueyen) • 300 to 1, 000 nm • BLUE and RED arms used independently or simultaneously using one of two dichoics • Max resolution (2 pix) 80, 000 & 110, 000 (blue/red arms respectively) slit width 0. 4”, R~40, 000 with 1. 0” slit • Image slicers for higher resolutions with ‘wider’ slits • Slit widths up to 10” (flux calibration) ESO p 2 pp 3 Workshop: UVES Overview | 12. 01. 2012 | John Pritchard

UVES The Ultraviolet & Visible Echelle Spectrograph Features • Magnitude limits: ~18/19 (blue/red) continuum source, 0. 7 arcsec seeing, 1 arcsec slit, no binning, 3 -hour integration time, S/N of 10 (per resolution element) at the peak of the central order, no moon. • Complete (almost) wavelength coverage from 300 to 1, 060 nm in two DICHROIC settings DIC 1 (346+580) + DIC 2 (437+860) • Radial velocity precision ~50 m/s • Attached wavelength calibrations • Iodine absorption cell • Simultaneous Th. Ar method (FLAMES/UVES 7+1 MOS mode) • Long slit, single order, mode (VM only) ESO p 2 pp 3 Workshop: UVES Overview | 12. 01. 2012 | John Pritchard

UVES The Ultraviolet & Visible Echelle Spectrograph p 2 pp and OBs • 4 instrument modes: BLUE, RED, DIC#1 & DIC#2 • Obs can NOT mix modes (except in RRM) • Standard setups (central wavelengths) vs. “complete” freedom • Attached calibrations ESO p 2 pp 3 Workshop: UVES Overview | 12. 01. 2012 | John Pritchard

UVES The Ultraviolet & Visible Echelle Spectrograph Summary • General purpose, high resolution, high efficiency, wide wavelength coverage, spectroscopic workhorse ESO p 2 pp 3 Workshop: UVES Overview | 12. 01. 2012 | John Pritchard