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Title:
Optical linear polarization of helium-rich white dwarfs samplewith the RoboPol polarimeter
Authors:
Slowikowska, Aga; Krzeszowski, Krzysztof; Zejmo, Michal; Blinov, Dmitry; Reig, Pablo
Affiliation:
AA(Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun, Grudziadzka 5, PL-87-100 Torun, Poland 0000-0003-4525-3178), AB(Janusz Gil Institute of Astronomy, University of Zielona Góra, Prof. Szafrana 2, PL-65-516 Zielona Góra,Poland), AC(Janusz Gil Institute of Astronomy, University of Zielona Góra, Prof. Szafrana 2, PL-65-516 Zielona Góra,Poland), AD(IESL, Foundation for Research and Technology - Hellas, Voutes, GR-71110 Heraklion, Greece; Department of Physics and Institute for Theoretical and Computational Physics, University of Crete, GR-71003 Heraklion Greece; Astronomical Institute, St. Petersburg State University, Universitetsky pr. 28, Petrodvoretz, 198504 St. Petersburg, Russia 0000-0003-0611-5784), AE(Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun, Grudziadzka 5, PL-87-100 Torun, Poland 0000-0002-6446-3050)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 4, p.5312-5324 (MNRAS Homepage)
Publication Date:
10/2018
Origin:
OUP
Astronomy Keywords:
polarization, stars: individual: WD1336+123, stars: individual: WD1415+234, stars: individual: WD1619+123, stars: individual: WD2129+000, white dwarfs
Abstract Copyright:
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sty1745
Bibliographic Code:
2018MNRAS.479.5312S

Abstract

We performed observations of 28 white dwarfs (WDs) as the second part of our WD optical linear polarimetric survey. Our study shows that highly linear polarized WDs are very rare. However, three systems, WD1336+123 (DB+dM4), WD1415+234 (DBA) and WD1619+123 (DA+dG0), show linear polarization degree higher than 1 per cent. In particular, WD1415+234 with polarization degree ˜2.6 per cent is the strongest polarized WD in our total sample of 101 objects. We found that the median polarization degree of isolated DA WDs and DB WDs is similar but lower than the median polarization of isolated DC WDs. The DB WDs in binaries seem to be more polarized than binaries containing DA+dM or double-degenerated systems (DDSs) with DA component. Additionally, we present for the first time, the measurements of optical linear polarization of both components in two common proper motion binary systems (CPMB) systems: WD1336+123 and the Sirius-like system WD2129+000. Because the vast majority of WDs have very low polarization degree (<0.5 per cent), they can be used as faint linear polarization standards. Our sample covers SDSS r magnitude range from 13 to 17 and right ascension range from 13h to 24h, with the extension from 1h to 3h.
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