2003A&A...403..613G


Query : 2003A&A...403..613G

2003A&A...403..613G - Astronomy and Astrophysics, volume 403, 613-624 (2003/5-4)

VLA multifrequency observations of RS CVn binaries.

GARCIA-SANCHEZ J., PAREDES J.M. and RIBO M.

Abstract (from CDS):

We present multiepoch Very Large Array (VLA) observations at 1.4GHz, 4.9GHz, 8.5GHz and 14.9GHz for a sample of eight RS CVn binary systems. Circular polarization measurements of these systems are also reported. Most of the fluxes observed are consistent with incoherent emission from mildly relativistic electrons. Several systems show an increase of the degree of circular polarization with increasing frequency in the optically thin regime, in conflict with predictions by gyrosynchrotron models. We observed a reversal in the sense of circular polarization with increasing frequency in three non-eclipsing systems: EI Eri, DM UMa and HD 8358. We find clear evidence for coherent plasma emission at 1.4 GHz in the quiescent spectrum of HD 8358 during the helicity reversal. The degrees of polarization of the other two systems could also be accounted for by a coherent emission process. The observations of ER Vul revealed two U-shaped flux spectra at the highest frequencies. The U-shape of the spectra may be accounted for by an optically thin gyrosynchrotron source for the low frequency part whereas the high frequency part is dominated by a thermal emission component.

Abstract Copyright:

Journal keyword(s): radio continuum: stars - stars: binaries: general - stars: binaries: eclipsing - polarization

Simbad objects: 23

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Number of rows : 23
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 QSO J0059+0003 QSO 00 59 22.6502935968 +00 03 01.440525204   23.24 21.11     ~ 54 0
2 QSO B0112-0142 QSO 01 15 17.09995153 -01 27 04.5772562   17 17.235 17.81   ~ 217 1
3 * 39 Cet RS* 01 16 36.2879453688 -02 30 01.328624496   6.310 5.428     G6III:eFe-2 255 0
4 V* BI Cet RS* 01 22 50.2948434816 +00 42 43.397347032   9.01 8.162 7.8 7.302 G5V 111 0
5 HD 8357 XB* 01 22 56.7568636416 +07 25 09.332224320 8.530 8.160   6.8   G5 168 0
6 QSO J0125-0006 Bla 01 25 28.8438355224 -00 05 55.930595964   16.92 16.64 16.30   ~ 282 1
7 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2750 2
8 G 272-61B Er* 01 39 01.6377185550 -17 57 01.001240728           M6V 842 0
9 QSO B0146+056 QSO 01 49 22.37088634 +05 55 53.5685702   20.7 19.0 20.30   ~ 124 1
10 * bet Per EB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1199 1
11 V* EI Eri RS* 04 09 40.8923562192 -07 53 34.175993568   7.71 7.04     G3V 280 0
12 QSO B0420-0127 QSO 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1163 3
13 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 1002 0
14 ICRF J103507.0+562846 Sy2 10 35 07.03998083 +56 28 46.7956247   20.2 21.244 20.200   ~ 184 1
15 V* DM UMa RS* 10 55 43.5438405648 +60 28 09.721480656   10.31 9.29     K0III-IV 164 0
16 V* RS CVn RS* 13 10 36.9077924448 +35 56 05.584994412 8.57 8.51 7.93 7.7   F6IV+G8IV 710 0
17 7C 130838.79+324935.00 QSO 13 10 59.40273257 +32 33 34.4495500     16.8 19.00   ~ 86 1
18 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4216 2
19 6C 161147+342017 QSO 16 13 41.06424322 +34 12 47.9088535   17.98 17.46 17.07   ~ 615 1
20 * sig CrB RS* 16 14 40.85557 +33 51 30.9497           F6V+G0V 491 0
21 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1083 0
22 HD 200391 Ae* 21 02 25.9070119848 +27 48 26.444060604   7.93 7.374   6.624 G0V+G5V 351 0
23 QSO J2115+295 QSO 21 15 29.41345155 +29 33 38.3669390     19.5 19.26   ~ 158 1

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2023.06.02-13:34:41

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