Table 1: Multifrequency observations of the eight RS CVn systems. All the dates are for year 1997. I represents the total intensity (and its uncertainty) in mJy, and  $\pi _{\rm c}$ the degree of circular polarization (and its uncertainty) in $\%$, for the four frequencies of observation. An asterisk indicates that the total intensity was variable during the corresponding observation at that frequency. Upper limits on I are given as 3$\sigma $ values. The three last columns list the radio luminosity at 4.9 GHz, $L_{\rm 4.9~GHz}$, and the spectral indexes $\alpha _{\rm 1.4 - 4.9}$ between 1.4 and 4.9 GHz and $\alpha _{\rm 4.9 - 8.5}$ between 4.9 and 8.5 GHz.

System

 Date I Total Intensity (mJy) $L_{\rm 4.9~GHz}$ Spectral
    $\pi _{\rm c}$ Circular Polarization Degree ($\%$) (erg s-1 Hz-1) Index
      1.4 GHz 4.9 GHz 8.5 GHz 14.9 GHz   $\alpha _{\rm 1.4 - 4.9}$ $\alpha _{\rm 4.9 - 8.5}$

HD 8357

 May 29 I $\leq$1.5 6.71 $\pm$ 0.04 5.92 $\pm$ 0.03 3.7 $\pm$ 0.1 1.5 $\times$ 1016   -0.2
    $\pi _{\rm c}$ -- 3.7 $\pm$ 0.6 4.2 $\pm$ 0.5 10 $\pm$ 2      
  Aug. 24 I    2.4 $\pm$ 0.4(*) 7.32 $\pm$ 0.04 6.27 $\pm$ 0.04 -- 1.6 $\times$ 1016 0.9 -0.3
    $\pi _{\rm c}$ 2.5 $\pm$ 2.7 5.1 $\pm$ 0.6 11.0 $\pm$ 0.5 --      
  Aug. 31 I 3.4 $\pm$ 0.5 19.42 $\pm$ 0.04 25.14 $\pm$ 0.05 23.8 $\pm$ 0.2 4.2 $\times$ 1016 1.4 0.5
    $\pi _{\rm c}$ -2.6 $\pm$ 2.0 -1.7 $\pm$ 0.2 -1.8 $\pm$ 0.1 -0.8 $\pm$ 0.9      
  Sep. 27 I $\leq$1.5 0.28 $\pm$ 0.05 0.16 $\pm$ 0.03 $\leq$0.3 6.1 $\times$ 1014   -1.0
    $\pi _{\rm c}$ -- 20 $\pm$ 10 37 $\pm$ 13 --      
  Oct. 29 I 0.7 $\pm$ 0.2 1.43 $\pm$ 0.04 1.48 $\pm$ 0.03 0.6 $\pm$ 0.1 3.1 $\times$ 1015 0.6 0.06
    $\pi _{\rm c}$ 4.3 $\pm$ 4.7 13 $\pm$ 2 17 $\pm$ 2 26 $\pm$ 17      

EI Eri

 May 29 I $\leq$5.7 2.18 $\pm$ 0.06    3.42 $\pm$ 0.04(*)    0.8 $\pm$ 0.1(*) 8.3 $\times$ 1015   0.8
    $\pi _{\rm c}$ -- -3.2 $\pm$ 1.2 -0.6 $\pm$ 1.1 -23 $\pm$ 13      
  Jun. 6 I $\leq$4.5 4.90 $\pm$ 0.04 4.41 $\pm$ 0.04 3.1 $\pm$ 0.1 1.9 $\times$ 1016   -0.2
    $\pi _{\rm c}$ -- 2.2 $\pm$ 0.6 -2.0 $\pm$ 0.8 -5.1 $\pm$ 3.0      
  Aug. 31 I    8 $\pm$ 2(*) 22.87 $\pm$ 0.06 22.79 $\pm$ 0.05 19.5 $\pm$ 0.2 8.7 $\times$ 1016 0.8 -0.01
    $\pi _{\rm c}$ 43 $\pm$ 13 0.26 $\pm$ 0.13 -1.3 $\pm$ 0.2 -1.5 $\pm$ 1.1      
  Oct. 29 I $\leq$0.9 1.52 $\pm$ 0.05 1.31 $\pm$ 0.03 0.9 $\pm$ 0.1 5.8 $\times$ 1015   -0.3
    $\pi _{\rm c}$ -- -10 $\pm$ 2 -17 $\pm$ 3 -21 $\pm$ 11      

DM UMa

 Jun. 6 I 9.2 $\pm$ 0.3 14.37 $\pm$ 0.05    12.29 $\pm$ 0.08(*)    2.7 $\pm$ 0.2(*) 3.3 $\times$ 1017 0.4 -0.3
    $\pi _{\rm c}$ 27 $\pm$ 1 -1.3 $\pm$ 0.2 -3.9 $\pm$ 0.3 -11 $\pm$ 7      
  Aug. 31 I 6.3 $\pm$ 0.7 8.09 $\pm$ 0.05 6.73 $\pm$ 0.06 5.2 $\pm$ 0.2 1.9 $\times$ 1017 0.2 -0.3
    $\pi _{\rm c}$ 5 $\pm$ 1 -3.0 $\pm$ 0.6 -5.5 $\pm$ 0.8 -9 $\pm$ 4      
  Sep. 27 I $\leq$1.2 1.4 $\pm$ 0.08 1.11 $\pm$ 0.06 0.9 $\pm$ 0.2 3.2 $\times$ 1016   -0.4
    $\pi _{\rm c}$ -- 5 $\pm$ 6 -7 $\pm$ 5 -22 $\pm$ 22      
  Oct. 2 I $\leq$1.5 0.79 $\pm$ 0.05 0.62 $\pm$ 0.05 0.6 $\pm$ 0.2 1.8 $\times$ 1016   -0.4
    $\pi _{\rm c}$ -- -6 $\pm$ 4 -37 $\pm$ 11 -43 $\pm$ 33      
  Oct. 3 I $\leq$1.5 0.82 $\pm$ 0.04 0.67 $\pm$ 0.04 -- 1.9 $\times$ 1016   -0.4
    $\pi _{\rm c}$ -- -8 $\pm$ 4 -15 $\pm$ 4 --      

${\sigma ^{2}}$ CrB

 Sept. 27 I $\leq$18 1.28 $\pm$ 0.05 1.17 $\pm$ 0.04 0.5 $\pm$ 0.1 7.2 $\times$ 1014   -0.2
    $\pi _{\rm c}$ -- -9 $\pm$ 3 -15 $\pm$ 3 10 $\pm$ 20      
  Oct. 3 I $\leq$12 4.43 $\pm$ 0.06    2.45 $\pm$ 0.05(*) 0.55 $\pm$ 0.08 2.5 $\times$ 1015   -1.1
    $\pi _{\rm c}$ -- -3.4 $\pm$ 0.9 -3.2 $\pm$ 1.4 32 $\pm$ 12      

HD 8358

 May 29 I 1.7 $\pm$ 0.5 3.09 $\pm$ 0.04 2.79 $\pm$ 0.03 2.06 $\pm$ 0.09 1.6 $\times$ 1016 0.5 -0.2
    $\pi _{\rm c}$ 6 $\pm$ 4 -4.2 $\pm$ 1.3 -11 $\pm$ 1 -29 $\pm$ 6      
  Aug. 24 I $\leq$1.2 1.03 $\pm$ 0.04 0.88 $\pm$ 0.03 -- 5.3 $\times$ 1015   -0.3
    $\pi _{\rm c}$ -- -17 $\pm$ 4 -9.0 $\pm$ 3.4 --      
  Aug. 31 I    2.2 $\pm$ 0.4(*) 1.94 $\pm$ 0.04 1.69 $\pm$ 0.04 $\leq$0.6 1.0 $\times$ 1016 -0.1 -0.3
    $\pi _{\rm c}$ 94 $\pm$ 20 -6 $\pm$ 2 -11 $\pm$ 2 --      
  Sep. 27 I $\leq$2.1 1.35 $\pm$ 0.04 1.44 $\pm$ 0.03 0.8 $\pm$ 0.1 7.0 $\times$ 1015   0.1
    $\pi _{\rm c}$ -- -5.9 $\pm$ 2.4 -10 $\pm$ 2 -48 $\pm$ 15      
  Oct. 29 I $\leq$0.9 0.76 $\pm$ 0.03 0.79 $\pm$ 0.03 $\leq$0.3 3.9 $\times$ 1015   0.07
    $\pi _{\rm c}$ -- -6 $\pm$ 4 -5.1 $\pm$ 2.7 --      
ER Vul Aug. 24 I $\leq$1.5 0.59 $\pm$ 0.06 0.27 $\pm$ 0.05 0.58 $\pm$ 0.07 1.8 $\times$ 1015   -1.4
    $\pi _{\rm c}$ -- 8 $\pm$ 5 15 $\pm$ 11 27 $\pm$ 12      
  Aug. 31 I $\leq$1.2 0.52 $\pm$ 0.04 0.42 $\pm$ 0.03 $\leq$0.6 1.6 $\times$ 1015   -0.4
    $\pi _{\rm c}$ -- 8 $\pm$ 6 16 $\pm$ 7 --      
  Oct. 2 I $\leq$6 0.64 $\pm$ 0.04 0.41 $\pm$ 0.04 0.5 $\pm$ 0.1 1.9 $\times$ 1015   -0.8
    $\pi _{\rm c}$ -- 8 $\pm$ 5 -12 $\pm$ 8 12 $\pm$ 20      
  Oct. 29 I $\leq$3 2.32 $\pm$ 0.04 3.05 $\pm$ 0.04 1.9 $\pm$ 0.1 6.9 $\times$ 1015   0.5
    $\pi _{\rm c}$ -- 2.6 $\pm$ 1.4 -1 $\pm$ 1 7 $\pm$ 5      

AY Cet

 May 29 I $\leq$0.9 0.43 $\pm$ 0.04 0.18 $\pm$ 0.03 $\leq$0.3 3.2 $\times$ 1015   -1.6
    $\pi _{\rm c}$ -- -13 $\pm$ 8 -30 $\pm$ 17 --      
  Sep. 27 I 1.2 $\pm$ 0.2 2.10 $\pm$ 0.05 1.84 $\pm$ 0.03 1.0 $\pm$ 0.1 1.6 $\times$ 1016 0.4 -0.2
    $\pi _{\rm c}$ -5 $\pm$ 3 -6 $\pm$ 2 -4 $\pm$ 1 7 $\pm$ 10      
  Oct. 2 I $\leq$1.2 0.78 $\pm$ 0.04 0.57 $\pm$ 0.03 $\leq$0.3 5.8 $\times$ 1015   -0.6
    $\pi _{\rm c}$ -- -7 $\pm$ 4 -16 $\pm$ 5 --      
  Oct. 29 I 0.7 $\pm$ 0.2 0.29 $\pm$ 0.03 $\leq$0.09 $\leq$0.3 2.1 $\times$ 1015 -0.7  
    $\pi _{\rm c}$ 1 $\pm$ 5 -34 $\pm$ 10 -- --      

RS CVn

 Jun. 6 I $\leq$1.5 1.60 $\pm$ 0.05 1.09 $\pm$ 0.04 $\leq$0.6 2.2 $\times$ 1016   -0.7
    $\pi _{\rm c}$ -- -2.5 $\pm$ 2.0 -8.3 $\pm$ 3.1 --      
  Oct. 3 I $\leq$1.2 0.16 $\pm$ 0.03 $\leq$0.09 -- 2.2 $\times$ 1015    
    $\pi _{\rm c}$ -- 94 $\pm$ 30 -- --      


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