A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
The RoboPol sample of optical polarimetric standards
Tekijät: Blinov D., Maharana S., Bouzelou F., Casadio C., Gjerløw E., Jormanainen J., Kiehlmann S., Kypriotakis J.A., Liodakis I., Mandarakas N., Markopoulioti L., Panopoulou G.V., Pelgrims V., Pouliasi A., Romanopoulos S., Skalidis R., Anche R.M., Angelakis E., Antoniadis J., Medhi B.J., Hovatta T., Kus A., Kylafis N., Mahabal A., Myserlis I., Paleologou E., Papadakis I., Pavlidou V., Papamastorakis I., Pearson T.J., Potter S.B., Ramaprakash A.N., Readhead A.C.S., Reig P., Słowikowska A., Tassis K., Zensus J.A.
Kustantaja: EDP Sciences
Julkaisuvuosi: 2023
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: Astronomy and Astrophysics
Artikkelin numero: A144
Vuosikerta: 677
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/202346778
Verkko-osoite: https://www.aanda.org/articles/aa/full_html/2023/09/aa46778-23/aa46778-23.html
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/181527862
Context.
Optical polarimeters are typically calibrated using measurements of stars with known and stable polarization parameters. However, there is a lack of such stars available across the sky. Many of the currently available standards are not suitable for medium and large telescopes due to their high brightness. Moreover, as we find, some of the polarimetric standards used are in fact variable or have polarization parameters that differ from their cataloged values.
Aims.
Our goal is to establish a sample of stable standards suitable for calibrating linear optical polarimeters with an accuracy down to 10−3 in fractional polarization.
Methods.
For 4 yr, we have been running a monitoring campaign of a sample of standard candidates comprised of 107 stars distributed across the northern sky. We analyzed the variability of the linear polarization of these stars, taking into account the non-Gaussian nature of fractional polarization measurements. For a subsample of nine stars, we also performed multiband polarization measurements.
Results.
We created a new catalog of 65 stars (see Table 2) that are stable, have small uncertainties of measured polarimetric parameters, and can be used as calibrators of polarimeters at medium and large telescopes.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
