High-resolution spectropolarimetry at the Italian Telescopio Nazionale Galileo

Franco Leone; Pietro Bruno; Antonio Cali; Riccardo Claudi; Rosario Cosentino; Giovanni Gentile; Raffaele Gratton; Salvatore Scuderi

doi:10.1117/12.458623

14 February 2003 High-resolution spectropolarimetry at the Italian Telescopio Nazionale Galileo

Franco Leone, Pietro Bruno, Antonio Cali, Riccardo Claudi, Rosario Cosentino, Giovanni Gentile, Raffaele Gratton, Salvatore Scuderi

Author Affiliations +

Proceedings Volume 4843, Polarimetry in Astronomy; (2003) https://doi.org/10.1117/12.458623
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

Citation Download Citation

Franco Leone, Pietro Bruno, Antonio Cali, Riccardo Claudi, Rosario Cosentino, Giovanni Gentile, Raffaele Gratton, and Salvatore Scuderi "High-resolution spectropolarimetry at the Italian Telescopio Nazionale Galileo", Proc. SPIE 4843, Polarimetry in Astronomy, (14 February 2003); https://doi.org/10.1117/12.458623

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