ESPRESSO: Flux standard stars
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HC PLOTS |
Efficiency |
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QC1 database (advanced users):
browse |
plot
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Spectroscopic flux standard stars are observed in order to measure the
absolute efficiency. They are measured on a bi-weekly basis
in HR with 1x1 and 2x1 binning and in UHR with 1x1 binning.
Observations in MR are not yet regularly executed.
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Flux standard star. Example raw frame for the blue detector. The apparent gaps in the orders come from the pre-/overscan of the read-out ports.
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Absolute efficiency
QC1_parameters
FITS key |
QC1 database: table, name |
definition |
class* |
HC_plot** |
more docu |
QC.MAX.ABS.EFF | espresso_std..abseff_max | maximum of absolute efficiency | HC | | [docuSys coming] |
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one. |
Trending
The absolute efficiency is trended separately for the five different combinations of resolving power and binning:
HR with 1x1 and 2x1 binning, UHR with 1x1 binning, and MR with 4x2 and 8x4
binning. In case of HR and UHR, it is also trended separately for each of the
four Untit Telescopes.
Scoring&thresholds Absolute efficiency
Scoring is not implemented since these are on-sky observations which are
intrinsically variable.
History
The trending plots only contain data measured after 2018-07-01. Earlier measurements
have been processed with pipeline versions that did not always give reliable results
for the maximum of the efficiency.
Algorithm Absolute efficiency
The trended quantity is the maximum of the efficiency over the complete spectral
range.
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