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Author Katajainen, S. ♦ Lehto, H. J. ♦ Berdyugin, A. ♦ Butters, O. ♦ Norton, A. J. ♦ Piirola, V.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ ASTROPHYSICS ♦ EMISSION ♦ MAGNETIC FIELDS ♦ NOVAE ♦ POLARIMETRY ♦ POLARIZATION ♦ SOFT X RADIATION ♦ TELESCOPES ♦ TIME RESOLUTION ♦ WHITE DWARF STARS ♦ BINARY STARS ♦ DWARF STARS ♦ ELECTROMAGNETIC RADIATION ♦ ERUPTIVE VARIABLE STARS ♦ IONIZING RADIATIONS ♦ PHYSICS ♦ RADIATIONS ♦ RESOLUTION ♦ STARS ♦ TIMING PROPERTIES ♦ VARIABLE STARS ♦ X RADIATION
Abstract We aim to investigate the magnetic field strengths and cyclotron emission of the two soft X-ray-emitting intermediate polars (IPs) UU Col and NY Lup. We study the connection between polars and soft X-ray-emitting IPs by searching for evidence of circularly polarized light in these two systems, which may be examples of progenitors of polars. We carried out photopolarimetric observations of our targets using the Very Large Telescope (UT2) and FORS1 at Paranal. Imaging polarimetry with good signal-to-noise and relatively high time resolution is possible for these targets using such a large telescope. Detection of circular polarization, modulated according to a white dwarf (WD) spin period, is clear evidence of cyclotron emission processes near the WD surface. The color dependence of the polarization allows us to make estimates of the magnetic field strength. We found that both UU Col and NY Lup emit circularly polarized light in the B and I bands, modulated at the spin period of the WD in each case. We add further confirmation to the idea that soft X-ray-emitting IPs emit circularly polarized light and that cyclotron emission plays an important role in these systems. This also suggests that some soft X-ray-emitting IPs might be progenitors of polars.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-11-20
Publisher Place United States
Journal Astrophysical Journal
Volume Number 724
Issue Number 1


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