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AMBER:
VLTI Calibrator Observations

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GENERAL

There is an ESO tool to select suitable calibrators for the VLTI instruments.

This tool uses a database compiled from a fits file. This fits file is used by the AMBER pipeline (as well as the other VLTI instruments pipelines). The calibrators are extracted from several catalogs:

  • Borde et al "A catalogue of calibrator stars for long baseline stellar interferometry" ( Astron. Astrophys. 393, 183-193, 2002)
  • Merand et al "A catalog of bright calibrator stars for 200-m baseline near-infrared stellar interferometry" ( Astron. Astrophys. 433, 1155-1162, 2005)
  • JMMC Stellar Diameter Catalog.
They cover short to long baselines, and some of them have data taken with the VLTI Commissioning instrument VINCI. It will be updated with AMBER observations on a regular basis. This catalog is available for the J, H and K bands.

The ESO tool is available on the ESO ETC page, under VLTI Calculators (CalVin), CalVin.

There are 2 versions of the tool, one which is retricted to configurations offered for the current or following period such as baselines, bands, resolutions, and an expert version which includes all the possible instrument settings. This is offered under CalVinExpert.

Monitoring of AMBER Calibrators

When a calibrators is observed with VLTI, it is processed by the pipeline in Garching and the uncalibrated V^2 obtained on the calibrators is monitored during the night. If a calibrator is found not suitable, it is added to the bad calibrator list maintained by the community.

 


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