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Proceedings Paper

High-resolution spectropolarimetry at the Italian Telescopio Nazionale Galileo
Author(s): Franco Leone; Pietro Bruno; Antonio Cali; Riccardo Claudi; Rosario Cosentino; Giovanni Gentile; Raffaele Gratton; Salvatore Scuderi
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Paper Abstract

The polarimeter built for the high resolution spectrograph (SARG) of the alto-azimuthal Telescopio Nazionale Galileo is presented. This double-beam instrument, able to take into account time independent (instrumental) and time dependent (sky transparence) sensitivity, is based on a Fresnel prism (λ/2) and K-prism (λ/4) which gives an almost constant retard along the very large wavelength interval covered with new spectrographs: SARG covers the 370 - 1020 nm range and more than 300 nm in a single exposure. The two flat metallic mirrors, which are necessary to feed the spectrograph, and the alto-azimuthal mounting of the telescope are responsible of an instrumental polarisation depending on the sky position of the target. A modelling of the instrumental polarisation and a hardware correction of the sky rotation are performed to measure the polarisation across stellar-like object at R=115,000 resolution.

Paper Details

Date Published: 14 February 2003
PDF: 11 pages
Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); doi: 10.1117/12.458623
Show Author Affiliations
Franco Leone, INAF (Italy)
Osservatorio Astrofisico di Catania (Italy)
Pietro Bruno, INAF (Italy)
Osservatorio Astrofisico di Catania (Italy)
Antonio Cali, INAF (Italy)
Osservatorio Astrofisico di Catania (Italy)
Riccardo Claudi, INAF (Italy)
Osservatorio Astrofisico di Padova (Italy)
Rosario Cosentino, INAF (Italy)
Osservatorio Astrofisico di Catania (Italy)
Giovanni Gentile, INAF (Italy)
Osservatorio Astrofisico di Catania (Italy)
Raffaele Gratton, INAF (Italy)
Osservatorio Astrofisico di Padova (Italy)
Salvatore Scuderi, INAF (Italy)
Osservatorio Astrofisico di Catania (Italy)


Published in SPIE Proceedings Vol. 4843:
Polarimetry in Astronomy
Silvano Fineschi, Editor(s)

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