On the spin modulated circular polarization from the intermediate polars NY Lup and IGR J15094-6649

Stephen B. Potter*, Encarni Romero-Colmenero, Marissa Kotze, Ewald Zietsman, O. W. Butters, Nikki Pekeur, David A. H. Buckley

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

5 Citations (Scopus)

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 languageEnglish
Pages (from-to)2596-2602
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume420
Issue number3
DOIs
Publication statusPublished - 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

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