A polarimetric study of the magnetic cataclysmic binary BL Hydri

Details A polarimetric study of the magnetic cataclysmic binary BL Hydri A polarimetric study of the magnetic cataclysmic binary BL Hydri

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...222..132s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 222, no. 1-2, Sept. 1989, p. 132-140.

Astronomy and Astrophysics

Astrophysics

15

Binary Stars, Cataclysmic Variables, Magnetic Stars, Polarimetry, Circular Polarization, Companion Stars, Polarization Characteristics

Scientific paper

A set of white-light linear and circular polarimetric data is used to redetermine the basic angles of the system. The standard analysis, which assumes a point-like emission region, yields a small inclination angle, i about 32 deg, and a magnetic colatitude of the accreting spot, delta about 114 deg, while previous work gave i about 70 deg and a correspondingly higher value of delta. It is suggested that three effects combine to explain the diverging results of different observers: (1) a finite extent of the main emission region; (2) the existence of a second emitting pole; and (3) stationary accretion at one or both of these regions. Model calculations for cases (1) and (2) are presented. They yield a wide variety of polarization angle curves for a given orbital inclination. The acceptable range of inclination angles based on these calculations is i = 20-60 deg. It is concluded that the complexity of the emission region in BL Hydri has so far prevented an exact determination of the inclination and the accretion geometry.

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