SIMBAD references

2006A&A...452..941A - Astronomy and Astrophysics, volume 452, 941-944 (2006/6-4)

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

ANDRONOV I.L., BAKLANOV A.V. and BURWITZ V.

Abstract (from CDS):

Result. 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=2451492.09876(14)+0.140235812(12)E. For the wide minima due to the spin variability, the quadratic ephemeris HJDspin=2449638.327427(74)+0.14062831(23)E -7.81(11)x10–10E2 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 M1=0.9 M and M2=0.3M, the estimated accretion rate is ∼7x10–10M/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.

Abstract Copyright:

Journal keyword(s): novae, cataclysmic variables - stars: rotation - stars: variables: general - white dwarfs - stars: magnetic fields

CDS comments: Comparison star C quoted in 1995PASP..107..307P not in Simbad.

Simbad objects: 6

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