The unique magnetic cataclysmic variable V1432 Aql. Third type of minima and synchronization

Details The unique magnetic cataclysmic variable V1432 Aql. Third type of minima and synchronization The unique magnetic cataclysmic variable V1432 Aql. Third type of minima and synchronization

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...452..941a&link_type=abstract

Astronomy and Astrophysics, Volume 452, Issue 3, June IV 2006, pp.941-944

Astronomy and Astrophysics

Astrophysics

5

Novae, Cataclysmic Variables, Stars: Rotation, Stars: Variables: General, White Dwarfs, Stars: Magnetic Fields

Scientific paper

Results of a CCD study of the variability of the unique magnetic cataclysmic variable V1432 Aql from the Astronomical Observatory of Mallorca are presented. The “multi-comparison star” method had been applied for better accuracy estimates. The linear ephemeris based on 76 timings of orbital eclipses for 1993-2004 is HJDmin = 2 451 492.09876(14) + 0.140235812(12)\cdot E. For the wide minima due to the spin variability, the quadratic ephemeris HJDspin=2 449 638.327427(74)+0.14062831(23)\cdot E -7.81(11) × 10-10E2 was determined. The rate of the spin-up of the white dwarf corresponds to the synchronization time-scale determined to be (96.7 ± 1.5) years, in an agreement with theoretical model of the accretion torque. A third type of minima was detected that occur with the spin period. It was interpreted as indicating presence of the second accretion column. For adopted values of mass M_1=0.9 M_&sun; and M_2=0.3 M_&sun;, the estimated accretion rate is 7 × 10-10 M_&sun;/yr. Further multi-colour monitoring is needed to study of late stages of the “spin-orbital” synchronization and periodic changes of the accretion geometry caused by “idling” of the white dwarf.

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