Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.295..511m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 295, p. 511
Astronomy and Astrophysics
Astronomy
31
Cataclysmic Variables, Magnetic Stars, Light Curve, Magnetic Poles, X Ray Astronomy, White Dwarf Stars, Stellar Mass Accretion
Scientific paper
An analysis of X-ray and optical light curves of the magnetic cataclysmic variable (MCV) BY Cam is presented. This system is one of three MCVs in which the spin period of the white dwarf and the binary orbital period differ by about 1 percent. As such, these 'BY Cam' stars are important objects with which to probe the field structure of the magnetic white dwarf and ultimately the nature of synchronization of AM Her binaries. We confirm asynchronous rotation of the magnetic white dwarf with respect to the binary. We find evidence that the accretion stream accretes directly onto the white dwarf as in AM Her systems, but, further, the stream impacts onto different magnetic poles over the course of the beat period. We present evidence that the optical and hard X-ray light curves modulate in phase, but together they are out of phase with the soft X-ray light curve. We confirm the spindown of the white dwarf which is expected to lead to the synchronization of the spin and orbital periods of BY Cam.
Andronov I. I.
Kolesnikov Sergey
Mason Paul A.
Pavlenko Elana
Ramsay Gavin
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