Using the X-shooter physical model to understand instrument flexure

Details Using the X-shooter physical model to understand instrument flexure Using the X-shooter physical model to understand instrument flexure

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010spie.7735e.239b&link_type=abstract

Ground-based and Airborne Instrumentation for Astronomy III. Edited by McLean, Ian S.; Ramsay, Suzanne K.; Takami, Hideki. Pro

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have developed a physical model of the VLT 2nd generation instrument X-shooter. The parameters of this model, that describe the positions, orientations and other physical properties of the optical components in the spectrograph, are continually updated by an optimisation process that ensures the best possible fit to arc lamp line positions in calibration exposures. Besides its use in driving the wavelength calibration in the data reduction pipeline, the physical model provides us with an insight into physical changes in the optical components and the possibility to correlate these with changing instrument orientation. By utilising a continually growing database of automatic flexure compensation exposures that cover a wide range of instrument orientations, we are able to investigate flexure in terms of physical model parameters.

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