Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-12
Astrophys.J. 583 (2003) 902-906
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Astrophysical Journal, vol. 583, February 1, 2003; slight revisions and additions in response
Scientific paper
10.1086/345418
Two newly identified magnetic cataclysmic variables discovered in the Sloan Digital Sky Survey (SDSS), SDSSJ155331.12+551614.5 and SDSSJ132411.57+032050.5, have spectra showing highly prominent, narrow, strongly polarized cyclotron humps with amplitudes that vary on orbital periods of 4.39 and 2.6 hrs, respectively. In the former, the spacing of the humps indicates the 3rd and 4th harmonics in a magnetic field of ~60 MG. The narrowness of the cyclotron features and the lack of strong emission lines imply very low temperature plasmas and very low accretion rates, so that the accreting area is heated by particle collisions rather than accretion shocks. The detection of rare systems like these exemplifies the ability of the SDSS to find the lowest accretion rate close binaries.
Anderson Scott F.
Frith James
Hall Patrick B.
Harris Hugh
Margon Bruce
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