Standard Stars for Linear Polarization Observed with FORS1
- Author(s)
- Luca Fossati, Stefano Bagnulo, Elena Mason, Egidio Landi Degl'Innocenti
- Abstract
We present the analysis of the observations of standard stars for linear polarization obtained from 1999 to 2005 within the context of the calibration plan of the FORS1 instrument of the ESO VLT. We have considered observations carried out both in imaging polarimetric and in spectropolarimetric mode. Broadband polarization was obtained in the Bessel BVRI filters; spectropolarimetry was obtained with various grisms covering different optical ranges and with a typical resolution of a few hundreds. Spectropolarimetric data have been convolved with the transmission functions of the Bessel filters, which enabled us to calculate polarization values equivalent to broadband polarization measurements in imaging mode. Finally, for each star, instrument mode, and for each Bessel filter band, we have calculated an average polarization value obtained after filtering all available data with a k?-clipping algorithm.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- European Southern Observatory (Germany), European Southern Observatory (Chile), University of Florence
- Pages
- 503
- Publication date
- 2007
- Austrian Fields of Science 2012
- 1030 Physics, Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/416f18e6-4e0e-41cc-8203-3294eb887d97