Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..460w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 460-467.
Astronomy and Astrophysics
Astronomy
58
Cataclysmic Variables, Magnetic Stars, Polarization Characteristics, Stellar Magnetic Fields, White Dwarf Stars, Accretion Disks, Bremsstrahlung, Circular Polarization, Cyclotron Radiation, Magnetic Moments
Scientific paper
Detailed calculations are presented of the polarization properties of extended accretion shocks on the surface of a magnetic white dwarf, where allowance is made both for field spread and for the change in shock height as a function of specific accretion rate. These results are used to show conclusively that the null detection of circular polarization in most IPs imply fields of less than 5 MG. The X-ray properties of MCVs depends critically on the fractional area of the white-dwarf surface over which accretion occurs, and on the type of accretion (smooth or clumpy). In the known IPs, accretion occurs via a disk. The accretion flow is smooth and a strong shock forms making them a powerful source of hard X-rays. There is a new class of MCV distinct from the IPs, where the white dwarf is asynchronous and accretes without a disk in which the accretion is clumpy and the radiation is mainly in the EUV region. A significant fraction of the IPs above the period gap evolve into such systems below the gap and not into AM Hers, as some workers have previously proposed. Any IP-AM Her transitions occur mainly above the period gap at P(O) greater than 4 hr.
Ferrario Lilia
Wickramasinghe Dayal T.
Wu Kinwah
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