2025ApJ...984..152L

Query : 2025ApJ...984..152L

2025ApJ...984..152L - Astrophys. J., 984, 152 (2025/May-2)

Detection of the White Dwarf Spin of the Long-orbital Period Magnetic Cataclysmic Variable V1082 Sgr.

LIMA I.J., TOVMASSIAN G., RODRIGUES C.V., OLIVEIRA A.S., LUNA G.J.M., BUCKLEY D.A.H., SILVA K.M.G., MATTIUCI A.C., SOUZA D.C., SCHLINDWEIN W., FALKENBERG F. and PALHARES M.S.

Abstract (from CDS):

We report on the discovery of circular polarization modulated with a period of 1.943 ± 0.002 hr in the cataclysmic variable V1082 Sgr. These findings unambiguously reveal the rotation of a magnetic white dwarf and establish its intermediate polar nature. Along with its extraordinary long orbital period (Porb) of 20.8 hr, the spin period (Pspin) places this system in an extreme position of the Pspin versus Porb distribution. The circular polarization phase diagram has a single peak and an amplitude smaller than 1%. These data were used to model the postshock region of the accretion flow on the white dwarf surface using the CYCLOPS code. We obtained a magnetic field in the white dwarf pole of 11 MG and a magnetospheric radius consistent with the coupling region at around 2-3 white dwarf radii. The Pspin/Porb value and the estimated magnetic field momentum suggest that V1082 Sgr could be out of spin equilibrium or in a spin-up state, possibly in a stream accretion mode.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Close binary stars - Cataclysmic variable stars - Starlight polarization - White dwarf stars - Stellar magnetic fields - Stellar accretion

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* GK Per No* 03 31 12.0098863320 +43 54 15.469951212   14.139 13.090 12.589   K1IV 986 0
2 V* V1062 Tau CV* 05 02 27.4778229096 +24 45 23.157957240   17.159 16.717 16.319   ~ 85 0
3 2MASS J05243042+4244506 CV* 05 24 30.4643309280 +42 44 50.460570600           ~ 55 0
4 IGR J17014-4306 CV* 17 01 28.1539648512 -43 06 12.307434264           ~ 35 0
5 1H 1726-058 CV* 17 30 21.9016405464 -05 59 31.840375236   17.04 16.15     ~ 96 0
6 HD 161056 * 17 43 47.0221609752 -07 04 46.594311996 6.26 6.68 6.32 5.94 5.67 B3II/III 201 0
7 V* AM Her CV* 18 16 13.2546725104 +49 52 04.759613537   15.124 14.808 13.525   M4.5-5Ve 1009 2
8 BD-12 5133 * 18 40 01.6961497488 -12 24 06.777653508 11.25 11.39 10.71 10.70   OB- 44 0
9 BD-13 5073 Be* 18 41 22.5614843136 -13 50 29.040846684 10.72 10.98 10.20 10.43   B3e 34 1
10 V* V1082 Sgr CV* 19 07 21.8657193048 -20 46 50.532061692           ~ 39 0
11 IGR J20063+3641 CV* 20 06 22.395 +36 41 43.57     18.4     ~ 15 0
12 CD-30 17706 WD* 20 10 56.8486912016 -30 13 06.627142663 11.654 12.286 12.242 12.311 12.381 DA3.1 267 0
13 RX J2015.6+3711 CV* 20 15 36.9637800072 +37 11 23.015915196     17.8     ~ 22 0
14 EGGR 141 WD* 20 42 34.7517579705 -20 04 35.932296319 11.511 12.315 12.396 12.488 12.602 DA2.5 119 0
15 EGGR 150 WD* 21 52 25.3789636654 +02 23 19.576176425 11.942 12.732 12.743 12.839 12.938 DA2.8 213 0

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