2009A&A...496..891B


Query : 2009A&A...496..891B

2009A&A...496..891B - Astronomy and Astrophysics, volume 496, 891-902 (2009/3-4)

Circular polarization survey of intermediate polars I. Northern targets in the range 17 H < RA < 23 H.

BUTTERS O.W., KATAJAINEN S., NORTON A.J., LEHTO H.J. and PIIROLA V.

Abstract (from CDS):

The origin, evolution, and ultimate fate of magnetic cataclysmic variables are poorly understood. It is largely the nature of the magnetic fields in these systems that leads to this poor understanding. Fundamental properties, such as the field strength and the axis alignment, are unknown in a majority of these systems. We undertake to put all the previous circular polarization measurements into context and systematically survey intermediate polars for signs of circular polarization, hence to get an indication of their true magnetic field strengths and try to understand the evolution of magnetic cataclysmic variables. We used the TurPol instrument at the Nordic Optical Telescope to obtain simultaneous UBVRI photo-polarimetric observations of a set of intermediate polars, during the epoch 2006 July 31-August 2. Of this set of eight systems two (1RXS J213344.1+510725 and 1RXS J173021.5-055933) were found to show significant levels of circular polarization, varying with spin phase. Five others (V2306 Cyg, AO Psc, DQ Her, FO Aqr, and V1223 Sgr) show some evidence for circular polarization and variation of this with spin phase, whilst AE Aqr shows little evidence for polarized emission. We also report the first simultaneous UBVRI photometry of the newly identified intermediate polar 1RXS J173021.5-055933. Circular polarization may be ubiquitous in intermediate polars, albeit at a low level of one or two percent or less. It is stronger at longer wavelengths in the visible spectrum. Our results lend further support to the possible link between the presence of soft X-ray components and the detectability of circular polarization in intermediate polars.

Abstract Copyright:

Journal keyword(s): infrared: stars - polarization - stars: binaries: general - stars: magnetic fields

Simbad objects: 22

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Number of rows : 22
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* V1033 Cas CV* 00 22 57.6446300016 +61 41 07.571581872           ~ 46 0
2 V* V709 Cas CV* 00 28 48.8267393856 +59 17 22.033767228     14.01     ~ 119 0
3 V* GK Per No* 03 31 12.0098863320 +43 54 15.469951212   14.139 13.090 12.589   K1IV 898 0
4 V* TV Col CV* 05 29 25.5292422792 -32 49 03.900212364   14.219 13.846 14.181   K2V 318 0
5 V* V405 Aur CV* 05 57 59.2934496792 +53 53 44.926489464           ~ 120 0
6 V* MU Cam XB* 06 25 16.2519466536 +73 34 39.105603804       14.3   ~ 63 0
7 V* BG CMi CV* 07 31 29.0079060264 +09 56 23.030740248   14.5       ~ 214 0
8 V* PQ Gem CV* 07 51 17.3280306912 +14 44 23.874868716           ~ 215 0
9 V* AR UMa CV* 11 15 44.5891034908 +42 58 22.431026739     16.4     D+M 134 0
10 V* DO Dra CV* 11 43 38.4921265896 +71 41 20.559036192       13.747   DQ 209 1
11 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.51 13.49 13.55   M5-6V 674 0
12 V* NY Lup XB* 15 48 14.5961459448 -45 28 39.918848376     14.50 14.42   K0/3Ve 89 1
13 V* V2400 Oph CV* 17 12 36.4233668016 -24 14 44.773987164     14.5     ~ 143 0
14 1H 1726-058 CV* 17 30 21.9016472695 -05 59 31.840647628   17.04 16.15     ~ 79 0
15 V* DQ Her CV* 18 07 30.2510391864 +45 51 32.564791872   14.605 14.443 14.800   M3+Ve 991 1
16 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 321 0
17 LAWD 73 WD* 19 00 10.2533239461 +70 39 51.416733790   13.24   13.5   DAP4.5 236 0
18 V* V2306 Cyg XB* 19 58 14.4693586728 +32 32 42.003103200 15.16 15.94 15.71 15.76   ~ 57 0
19 V* AE Aqr CV* 20 40 09.1598959176 -00 52 15.055595220   12.46 10.40   10.191 K3-5IV/V 646 0
20 RX J2133.7+5107 CV* 21 33 43.6348450728 +51 07 24.729535560   15.80       ~ 68 0
21 V* FO Aqr CV* 22 17 55.3796835600 -08 21 03.754995948           ~ 343 0
22 V* AO Psc CV* 22 55 17.9860863984 -03 10 39.981831564           ~ 299 0

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2022.09.30-06:10:05

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