Generally UVES calibration data are taken as daytime calibrations. On request by the user, also nighttime calibrations can be obtained as part of the Observing Block which generates the SCIENCE data ("attached calibrations").
All calibration data taken in UVES standard settings are processed by the QC group to obtain calibration solutions. These solutions come as
The following table contains an overview of the raw calibration files for the UVES echelle mode. The data types are identified with the DPR TYPE keyword of the fits headers.
typical number taken at night
detector status, bias level
3 per month for monitoring
align spectral format to physical model
ORDER DEFINITION FLAT
define position of orders and interorder background
fix-pattern noise, fringing, slit function, blaze function
ECHELLE DEUTERIUM FLAT
same as ECHELLE FLAT, but higher sensitivity in the extreme blue (346 nm)
ECHELLE ABSORPTION-CELL FLAT
ECHELLE FLAT with the Iodine absorption cell switched on (setting RED 600 1x1)
STANDARD STAR EXPOSURE
spectral response of telescope, instrument, detector; efficiency
FLATs are taken for each setting and slit width used for SCIENCE data.
Examples of raw UVES frames, FITS headers, and some pipeline products are available from the
UVES reference frames page.
For a complete overview of the data types and their dependencies, check the calibration cascade.
The processing of UVES calibration frames requires a cascading scheme where the mutual dependencies of products and raw frames have to be respected.
Some products (master bias, first guess line table) can be produced from raw files only, but most products require the prior generation of other calibration products.
The proper sequence of all these production steps is called the calibration cascade (see here ).
Within that cascade, all products are checked with respect to their quality and their relationship in time. This means e.g. that a master flat is not only generated using an arbitrary quality-checked order table, but that specific table is chosen which at the moment of processing is closest in time.
All products created by QC Garching respect the calibration cascade.
The flux standard table contains tabulated fluxes for the flux standard stars in use for UVES.
They have been part of the data packages for UVES data, and they are also delivered through the calSelector archive service.