2006A&A...452..941A


Query : 2006A&A...452..941A

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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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* BY Cam CV* 05 42 48.8013535344 +60 51 31.376128608   16.60       ~ 242 0
2 V* MU Cam XB* 06 25 16.2519466536 +73 34 39.105603804       14.3   ~ 62 0
3 V* V1432 Aql CV* 19 40 11.4199326288 -10 25 25.771706256     14.40 15.437   ~ 154 0
4 V* WZ Sge CV* 20 07 36.5037622512 +17 42 14.733254952   15.30 15.20     DAepv 914 0
5 V* V1500 Cyg No* 21 11 36.5809818696 +48 09 01.952490204           ~ 766 0
6 V* CD Ind CV* 21 15 41.0450813472 -58 40 54.058462428           ~ 84 0

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2022.05.28-04:01:31

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