Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..474c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 474-482. Research supported by CNPq.
Astronomy and Astrophysics
Astrophysics
1
Binary Stars, Magnetic Stars, Stellar Mass Accretion, White Dwarf Stars, Circular Polarization, Linear Polarization, Stellar Magnetic Fields, Stellar Models
Scientific paper
The present study investigates whether an accretion column with a large diameter can produce the almost null circular and linear polarization observed in DQ-Herculis-type cataclysmic variables, taking into account the variations of the magnetic field, density, and temperature with height and diameter of the accretion column. The following were found: (1) a large area of accretion (f = 0.092); (2) variations of magnetic field, density, and temperature parallel and perpendicular to the accretion column axis; (3) an emitting accretion column height of 0.04 Rwd; (4) a temperature variation along the accretion column approximately equal to 1-5 keV/kB; and (5) a density at the center of the base of the accretion column of 7 x 10 exp 16/cu cm. A comparison is made with the observed polarization values of BG CMi. Good fits are obtained for polar magnetic fields of about 15 MG. The model predicts small circular polarization (less than 1 percent) in the optical region and a rapid rise (about 4 percent) in the IR.
Canalle B. G. J.
Opher Reuven
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