Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322l..35w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. L35-L39.
Astronomy and Astrophysics
Astrophysics
51
Binary Stars, Cataclysmic Variables, Circular Polarization, Cyclotron Radiation, Emission Spectra, Near Infrared Radiation, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Mass Ejection, White Dwarf Stars
Scientific paper
BG CMi is the only intermediate polar known to be magnetic. New observations reported here reveal that its wavelength dependence of circular polarization increases rapidly into the infrared, from VI= -0.25%±0.06% in the optical red to VJ= -1.74%±0.26% (1.25 μm). This dramatic rise, which may even continue to a level of -4% at H (1.5 μm), is the first conclusive identification of cyclotron emission in an intermediate polar, and confirms that the long-held basic model of a magnetic accreting white dwarf is correct. The field in the cyclotron emission region of BG CMi is likely in the range ≡5 - 10 MG.
Berriman Graham
Schmidt Gary D.
West Steven C.
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