Abstract
We report on high-time-resolution, high-signal-to-noise ratio (S/N), photopolarimetry of the intermediate polars NY Lup and IGR J150946649. Our observations confirm the detection and colour dependence of circular polarization from NY Lup and additionally show a clear white dwarf, spin modulated signal. From our new high-S/N photometry, we have unambiguously detected wavelength-dependent spin and beat periods and harmonics thereof. IGR J150946649 is also discovered to have a particularly strong spin modulated circularly polarized signal. It appears double peaked through the I filter and single peaked through the B filter, consistent with cyclotron emission from a white dwarf with a relatively strong magnetic field.
Original language | English |
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Pages (from-to) | 2596-2602 |
Number of pages | 7 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 420 |
Issue number | 3 |
DOIs | |
Publication status | Published - Mar 2012 |
Keywords
- accretion, accretion discs
- methods: analytical
- techniques: polarimetric
- binaries: close
- novae, cataclysmic variables
- X-rays: stars
- MAGNETIC CATACLYSMIC VARIABLES
- X-RAY EMISSION
- WHITE-DWARFS
- 1RXS J154814.5-452845
- OPTICAL OBSERVATIONS
- 1WGA J1958.2+3232
- DISCOVERY
- STARS
- SPECTROSCOPY
- CYCLOTRON