@Article{PereyraRodrMart:2015:MeCoPo,
author = "Pereyra, Antonio and Rodrigues, Cl{\'a}udia Vilega and Martioli,
E.",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Laborat{\'o}rio
Nacional de Astrof{\'{\i}}sica (LNA)}",
title = "Measuring the continuum polarization with ESPaDOnS",
journal = "Astronomy \& Astrophysics",
year = "2015",
volume = "573",
month = "Jan.",
keywords = "Instrumentation: polarimeters, Polarization, Stars: pre-main
sequence, Techniques: polarimetric.",
abstract = "Aims. Our goal is to test the feasibility of obtaining accurate
measurements of the continuum polarization from high-resolution
spectra using the spectropolarimetric mode of ESPaDOnS. Methods.
We used the new pipeline OPERA to reduce recent and archived
ESPaDOnS data. Several polarization standard stars and science
objects were tested for the linear mode. In addition, the circular
mode was tested using several objects from the archive with
expected null polarization. Synthetic broad-band polarization was
computed from the ESPaDOnS continuum polarization spectra and
compared with published values (when available) to quantify the
accuracy of the instrument. Results. The continuum linear
polarization measured by ESPaDOnS is consistent with broad-band
polarimetry measurements available in the literature. The accuracy
in the degree of linear polarization is around 0.2-0.3%
considering the full sample. The accuracy in polarization position
angle using the most polarized objects is better than 5°.
Consistent with this, the instrumental polarization computed for
the circular continuum polarization is also between 0.2-0.3%. Our
results suggest that measurements of the continuum polarization
using ESPaDOnS are viable and can be used to study many
astrophysical objects.",
doi = "10.1051/0004-6361/201423492",
url = "http://dx.doi.org/10.1051/0004-6361/201423492",
issn = "0004-6361 and 1432-0746",
language = "en",
urlaccessdate = "27 abr. 2024"
}