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ELODIE spectrograph
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ELODIE spectrograph : ウィキペディア英語版
ELODIE spectrograph
ELODIE was an echelle type spectrograph installed at the Observatoire de Haute-Provence 1.93m reflector in south-eastern France for the (Northern Extrasolar Planet Search ). Its optical instrumentation was developed by André Baranne from the Marseille Observatory. The purpose of this instrument was extrasolar planet detection by the radial velocity method. This instrument was also used for the (M-Dwarf Programmes ).
ELODIE first light was achieved in 1993. ELODIE was decommissioned in August 2006 and replaced in September 2006 by SOPHIE, a new instrument of the same type but with improved features.〔(The ELODIE-SOPHIE Archive in the Virtual Observatory ), S. Ilovaisky, Ph. Prugniel, C. Soubiran, M. Koleva, and H. Le Coroller, in ''Astronomical spectroscopy and the Virtual Observatory, Madrid (Spain), March 21–23, 2007'', Madrid, 2007.〕〔(A user's guide to Elodie archive data products ), Elodie archive, Observatoire de Haute Provence. Accessed on line June 15, 2008.〕
==Characteristics==
The electromagnetic spectrum wavelength range is 389.5 nm to 681.5 nm in a single exposure, split into 67 spectral orders. The instrument, which was located in a temperature-controlled room, was fed with optical fibers from the Cassegrain focus. One of the unique features of ELODIE was an integrated data reduction pipeline which fully reduces the spectra immediately after acquisition and allows the user to measure highly accurate radial velocities through cross-correlation with a numerical mask. This accuracy can reach ±7 m/s.
Over 34,000 spectra have been taken with this instrument so far, over 20,000 of which are publicly available through a dedicated on-line archive.〔(The ELODIE archive ). Accessed on line June 15, 2008.〕 ELODIE was the result of a collaboration between the observatories of Haute-Provence, Geneva and Marseille. A publication describing the instrument appeared in ''Astronomy & Astrophysics Supplements''.〔ELODIE: A spectrograph for accurate radial velocity measurements, A. Baranne et al., ''Astronomy and Astrophysics Supplement'' 119 (October 1996), pp.373–390. 〕

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