\begin{table} \caption{\label{table radio data}Reduction of the Cyg~OB2 No.~8A VLA data. } \begin{tabular}{lllrrcrrrlcl} \hline\hline & \multicolumn{1}{c}{(1)} & \multicolumn{1}{c}{(2)} & \multicolumn{1}{c}{(3)} & \multicolumn{1}{c}{(4)} & \multicolumn{1}{c}{(5)} & \multicolumn{1}{c}{(6)} & \multicolumn{1}{c}{(7)} & \multicolumn{1}{c}{(8)} & \multicolumn{1}{c}{(9)} & \multicolumn{1}{c}{(10)} & \multicolumn{1}{l}{(11)} \\ & \multicolumn{1}{c}{Progr.} & \multicolumn{1}{c}{Date} & \multicolumn{1}{c}{Ctr.} & \multicolumn{3}{c}{Phase calibrator} & \multicolumn{1}{c}{Int.} & \multicolumn{1}{c}{No.} & \multicolumn{1}{c}{Config.} & \multicolumn{1}{c}{Flux} & \multicolumn{1}{l}{Notes}\\ \cline{5-7} & & & & \multicolumn{1}{c}{Name} & \multicolumn{1}{c}{Flux} & \multicolumn{1}{c}{Dist.} & \multicolumn{1}{c}{time} & \multicolumn{1}{c}{Ants.} & & \multicolumn{1}{c}{} & \\ & & & & \multicolumn{1}{c}{} & \multicolumn{1}{c}{(Jy)} & \multicolumn{1}{c}{(degr.)} & \multicolumn{1}{c}{(min)} & \multicolumn{1}{c}{} & & \multicolumn{1}{c}{(mJy)} & \\ \hline \multicolumn{3}{l}{2 cm} \\* & AA28 & 1984-03-04 & 8 & 2007+404 & $3.33 \pm 0.28$ & 4.9 & 20 & 27 & CnB & $0.7 \pm 0.4$ & \tablefootmark{a} \\ & AC116 & 1984-12-21 & 8 & 2007+404 & $3.96 \pm 0.07$ & 4.9 & 10 & 27 & A & $0.62\pm 0.19$ & \tablefootmark{a} \\ & AS786 & 2004-02-15 & 7 & 2015+371 & $2.88 \pm 0.03$ & 5.4 & 60 & 26 & CnB & $<$4. & \\ \multicolumn{3}{l}{3.6 cm} \\* & AS397 & 1990-02-16 & 8 & 2007+404 & $3.10 \pm 0.04$ & 4.9 & 59 & 22 & A & $0.48\pm 0.05$ & \\ & AH395 & 1990-02-17 & 8 & 2007+404 & $3.05 \pm 0.01$ & 4.9 & 44 & 22 & A & $0.66\pm 0.04$ & \\ & AW288 & 1991-07-04 & 8 & 2025+337 & $2.08 \pm 0.06$ & 7.7 & 5 & 26 & A & $0.70\pm 0.09$ & \tablefootmark{b} \\ & AW304 & 1992-01-24 & 8 & 2007+404 & $2.87 \pm 0.03$ & 4.9 & 12 & 24 & CnB & $1.06\pm 0.07$ & S\tablefootmark{b} \\ & BP1 & 1992-05-30 & 9 & 2052+365 & $1.87 \pm 0.01$ & 6.0 & 99 & 23 & DnC & $<$1.1 & \\ & AB671 & 1993-01-24 & 9 & 2007+404 & $3.33 \pm 0.07$ & 4.9 & 23 & 27 & A & $<$5. & S \\ & AB671 & 1993-01-29 & 9 & 2007+404 & $3.33 \pm 0.02$ & 4.9 & 24 & 27 & BnA & $<$2.0 & S \\ & AB671 & 1993-02-01 & 9 & 2007+404 & $3.29 \pm 0.03$ & 4.9 & 6 & 27 & BnA & $<$4. & \\ & AB671 & 1993-02-14 & 9 & 2007+404 & $3.41 \pm 0.03$ & 4.9 & 7 & 27 & BnA & $<$4. & S \\ & AB671 & 1993-02-20 & 9 & 2007+404 & $3.8 \pm 0.1 $ & 4.9 & 14 & 24 & B & $<$5. & \\ & AS483 & 1993-05-01 & 98& 2007+404 & $3.28 \pm 0.01$ & 4.9 & 25 & 27 & B & $1.19\pm 0.13$ & S\tablefootmark{b} \\ & AR277 & 1994-04-17 & 9 & 2007+404 & $2.97 \pm 0.01$ & 4.9 & 23 & 14 & A & $<$5. & S \\ & AR328 & 1995-04-27 & 9 & 2007+404 & $2.77 \pm 0.01$ & 4.9 & 11 & 16 & D & $<$2.7 & \\ & AS644 & 1999-02-05 & 7 & 2007+404 & $2.07 \pm 0.12$ & 4.9 & 35 & 23 & DnC & $1.0 \pm 0.3 $ & \\ & AS644 & 1999-04-18 & 8 & 2015+371 & $2.17 \pm 0.01$ & 4.9 & 5 & 27 & D & $0.92\pm 0.10$ & \\ & AW515 & 1999-06-08 & 9 & 2007+404 & $2.02 \pm 0.01$ & 4.9 & 10 & 19 & AD & $<$2.8 & I,S \\ & BB116 & 1999-12-04 & 9 & 2007+404 & $2.20 \pm 0.01$ & 4.9 & 101 & 27 & B & $1.96\pm 0.26$ & \\ & BB116 & 2000-06-26 & 9 & 2007+404 & $2.40 \pm 0.01$ & 4.9 & 20 & 26 & DnC & $2.9 \pm 2.3 $ & \\ & AS786 & 2004-02-15 & 7 & 2015+371 & $2.76 \pm 0.02$ & 5.4 & 45 & 25 & CnB & $1.12\pm 0.18$ & \tablefootmark{c} \\ & BD110 & 2005-11-15 & 9 & 2007+404 & $2.29 \pm 0.02$ & 4.9 & 21 & 22 & D & $<$2.1 & S \\ & AB1195 & 2006-01-26 & 8 & 2007+404 & $2.37 \pm 0.05$ & 4.9 & 31 & 16 & AD & $0.58\pm 0.27$ & \\ & AB1210 & 2006-05-24 & 8 & 2007+404 & $2.21 \pm 0.02$ & 4.9 & 27 & 21 & BnA & $0.98\pm 0.05$ & \\ \multicolumn{5}{l}{{6 cm}}\\* & CHUR & 1980-05-23 & 8 & 2007+404 & $4.73 \pm 0.03$ & 4.9 & 47 & 22 & AD & $1.33\pm 0.13$ & $1\times 50 $\tablefootmark{a} \\ & CHUR & 1980-05-24 & 8 & 2007+404 & $4.58 \pm 0.03$ & 4.9 & 47 & 22 & AD & $1.18\pm 0.11$ & $1\times 50 $\tablefootmark{a} \\ & BIGN & 1981-10-16 & 9 & 2007+404 & $4.16 \pm 0.04 $ & 4.9 & 17 & 27 & C & $0.8 \pm 0.4 $ & S, $1\times 50$ \\ & BECK & 1982-03-27 & 9 & 2007+404 & $4.74 \pm 0.01 $ & 4.9 & 228 & 27 & A & $1.5 \pm 0.4 $ & S, $1\times 50 $ \\ & BECK & 1982-07-03 & 9 & 2007+404 & $4.95 \pm 0.02 $ & 4.9 & 5 & 26 & A & $<$5. & S, $1\times 50 $ \\ & BIEG & 1982-08-26 & 9 & 2007+404 & $4.4 \pm 0.1 $ & 4.9 & 9 & 24 & B & $<$3. & $1\times 50$ \\ & BECK & 1982-12-21 & 9 & 2023+318 & $2.86 \pm 0.01 $ & 9.6 & 9 & 24 & D & $<$2.4 & S, $1\times 50$ \\ & AC42 & 1983-05-09 & 9 & 2007+404 & $4.46 \pm 0.02 $ & 4.9 & 10 & 26 & C & $<$1.2 & $1\times 50$ \\ & AC42 & 1983-08-22 & 9 & 2007+404 & $4.85 \pm 0.01 $ & 4.9 & 14 & 25 & A & $<$4. & \\ & AB228 & 1983-08-27 & 9 & 2007+404 & $4.90 \pm 0.03 $ & 4.9 & 18 & 27 & A & $<$3. & \\ & AB252 & 1983-10-30 & 9 & 2007+404 & $4.84 \pm 0.02 $ & 4.9 & 9 & 26 & A & $<$4. & S \\ & AA28 & 1984-03-04 & 8 & 2007+404 & $4.27 \pm 0.01 $ & 4.9 & 41 & 27 & CnB & $0.91\pm 0.10$ & \tablefootmark{a} \\ & AA28 & 1984-03-09 & 8 & 2007+404 & $4.33 \pm 0.01 $ & 4.9 & 23 & 26 & CnB & $0.78\pm 0.13$ & \\ & AA29 & 1984-04-04 & 9 & 2007+404 & $4.21 \pm 0.02 $ & 4.9 & 11 & 27 & C & $<$0.9 & S\tablefootmark{a} \\ & VM59 & 1984-10-16 & 9 & 2202+422 & $2.72 \pm 0.01 $ & 16.7 & 13 & 26 & D & $<$2.4 & S \\ & AC116 & 1984-11-27 & 9 & 2007+404 & $4.50 \pm 0.01 $ & 4.9 & 19 & 25 & A & $<$2.8 & S \\ & AC116 & 1984-12-21 & 8 & 2007+404 & $4.63 \pm 0.01 $ & 4.9 & 6 & 27 & A & 0.56 $\pm$ 0.13 & \tablefootmark{a} \\ & AF102 & 1985-05-09 & + & 2022+616 & $2.43 \pm 0.01 $ & 20.4 & 9 & 26 & B & $<$1.3 & S \\ & AA47 & 1985-06-12 & 7 & 2007+404 & $3.87 \pm 0.01 $ & 4.9 & 24 & 22 & B & 0.98 $\pm$ 0.27 & \\ & AA47 & 1985-09-01 & 9 & 2007+404 & $3.53 \pm 0.01 $ & 4.9 & 7 & 27 & C & $<$1.0 & \\ & AA47 & 1985-09-19 & 9 & 2007+404 & $3.56 \pm 0.01 $ & 4.9 & 11 & 25 & C & $<$0.8 & \\ & VM115 & 1990-06-11 & 9 & 2202+422 & $3.24 \pm 0.01 $ & 16.7 & 19 & 22 & A & $<$1.6 & \\ & AG320 & 1991-03-06 & SE& 2007+404 & $2.73 \pm 0.01 $ & 5.3 & 10 & 25 & D & 1.4 $\pm$ 0.6 & \\ & AB671 & 1993-01-21 & 9 & 2007+404 & $3.09 \pm 0.01 $ & 4.9 & 19 & 24 & A & $<$2.3 & S \\ & AB671 & 1993-01-24 & 9 & 2007+404 & $3.08 \pm 0.03 $ & 4.9 & 18 & 27 & A & $<$2.8 & S \\ & AB671 & 1993-01-29 & 9 & 2007+404 & $3.12 \pm 0.02 $ & 4.9 & 19 & 27 & BnA & 2.1 $\pm$ 1.1 & S \\ & AB671 & 1993-02-01 & 9 & 2007+404 & $3.11 \pm 0.01 $ & 4.9 & 7 & 27 & BnA & 1.2 $\pm$ 0.7 & S \\ & AB671 & 1993-02-14 & 9 & 2007+404 & $3.12 \pm 0.02 $ & 4.9 & 8 & 27 & BnA & 2.2 $\pm$ 1.4 & \\ & AS483 & 1993-05-01 & 98& 2007+404 & $3.04 \pm 0.01 $ & 4.9 & 21 & 25 & B & 1.33 $\pm$ 0.16 & \tablefootmark{b} \\ & TST6CM & 1993-06-04 & 9 & 2052+365 & $5.2 \pm 0.2 $ & 6.0 & 29 & 26 & CnB & $<$0.8 & X \\ & AR277 & 1994-04-17 & 9 & 2007+404 & $3.04 \pm 0.01 $ & 4.9 & 23 & 15 & A & $<$4. & \\ & AR328 & 1995-04-27 & 9 & 2007+404 & $2.982\pm 0.003$ & 4.9 & 11 & 16 & D & $<$2.3 & \\ & AS644 & 1999-02-05 & 7 & 2007+404 & $2.6 \pm 0.1 $ & 4.9 & 20 & 23 & DnC & 1.1 $\pm$ 0.5 & \\ & AS644 & 1999-04-18 & 8 & 2015+371 & $1.728\pm 0.003$ & 5.4 & 5 & 26 & D & 0.93 $\pm$ 0.19 & \\ & AW515 & 1999-06-08 & 9 & 2007+404 & $2.40 \pm 0.03 $ & 4.9 & 10 & 21 & AD & $<$1.4 & I, S \\ & AS786 & 2004-02-15 & 7 & 2015+371 & $2.778\pm 0.003$ & 5.4 & 61 & 26 & CnB & 1.21 $\pm$ 0.28 & \tablefootmark{c} \\ & AB1156 & 2005-02-04 & 8 & 2007+404 & $2.47 \pm 0.01 $ & 4.9 & 31 & 25 & BnA & 1.28 $\pm$ 0.05 & \\ & AB1156 & 2005-02-06 & 8 & 2007+404 & $2.50 \pm 0.02 $ & 4.9 & 31 & 25 & BnA & 1.27 $\pm$ 0.06 & \\ & AB1156 & 2005-02-08 & 8 & 2007+404 & $2.52 \pm 0.01 $ & 4.9 & 31 & 25 & BnA & 1.11 $\pm$ 0.12 & \\ & AB1156 & 2005-02-11 & 8 & 2007+404 & $2.52 \pm 0.01 $ & 4.9 & 31 & 25 & BnA & 0.88 $\pm$ 0.07 & \\ & AB1156 & 2005-02-13 & 8 & 2007+404 & $2.49 \pm 0.02 $ & 4.9 & 31 & 24 & BnA & 0.76 $\pm$ 0.05 & \\ & AB1156 & 2005-02-18 & 8 & 2007+404 & $2.44 \pm 0.01 $ & 4.9 & 51 & 24 & B & 0.64 $\pm$ 0.04 & \\ & AB1156 & 2005-02-25 & 8 & 2007+404 & $2.49 \pm 0.01 $ & 4.9 & 30 & 24 & B & 1.11 $\pm$ 0.06 & \\ & AB1156 & 2005-02-27 & 8 & 2007+404 & $2.49 \pm 0.01 $ & 4.9 & 51 & 25 & B & 0.98 $\pm$ 0.06 & \\ & AB1156 & 2005-02-28 & 8 & 2007+404 & $2.47 \pm 0.01 $ & 4.9 & 30 & 25 & B & 1.29 $\pm$ 0.05 & \\ & AB1156 & 2005-03-01 & 8 & 2007+404 & $2.410\pm 0.004$ & 4.9 & 31 & 24 & B & 1.14 $\pm$ 0.07 & \\ & AB1156 & 2005-03-02 & 8 & 2007+404 & $2.44 \pm 0.01 $ & 4.9 & 29 & 25 & B & 1.26 $\pm$ 0.05 & \\ & AB1156 & 2005-03-08 & 8 & 2007+404 & $2.44 \pm 0.01 $ & 4.9 & 26 & 25 & B & 0.72 $\pm$ 0.05 & \\ & AB1156 & 2005-03-12 & 8 & 2007+404 & $2.43 \pm 0.01 $ & 4.9 & 30 & 25 & B & 0.73 $\pm$ 0.05 & \\ & BD110 & 2005-11-15 & 9 & 2007+404 & $2.51 \pm 0.01 $ & 4.9 & 18 & 21 & D & $<$1.9 & S \\ \multicolumn{5}{l}{{20 cm}}\\* & BIEG & 1982-08-26 & 12& 2007+404 & $4.00 \pm 0.04 $ & 4.8 & 53 & 24 & B & $<$3.1 & \\ & AB228 & 1983-08-25 & 9 & 2007+404 & $4.19 \pm 0.02 $ & 4.9 & 28 & 24 & A & $<$2.2 & \\ & AB228 & 1983-08-27 & 12& 2007+404 & $4.31 \pm 0.02 $ & 4.8 & 107 & 26 & A & $<$2.5 & \\ & AA28 & 1984-03-09 & 8 & 2007+404 & $4.15 \pm 0.02 $ & 4.9 & 26 & 26 & CnB & $1.14 \pm 0.28$ & \\ & AC116 & 1984-11-27 & 9 & 2007+404 & $4.06 \pm 0.02 $ & 4.9 & 33 & 25 & A & $ 2.6 \pm 0.8 $ & \\ & AC116 & 1984-12-21 & 8 & 2007+404 & $3.98 \pm 0.03 $ & 4.9 & 11 & 27 & A & $1.29 \pm 0.13$ & \tablefootmark{a} \\ & AT61 & 1985-04-04 & 9 & 2052+365 & $5.43 \pm 0.01 $ & 6.0 & 14 & 25 & BnA & $<$1.7 & \\ & AA47 & 1985-09-19 & 9 & 2007+404 & $3.92 \pm 0.04 $ & 4.9 & 13 & 26 & C & $<$4. & S \\ & AR170 & 1987-10-16 & 5 & 2052+365 & $5.20 \pm 0.02 $ & 6.2 & 26 & 23 & BnA & 2.1 $\pm$ 1.2 & \\ & AR170 & 1987-11-09 & 5 & 2052+365 & $5.07 \pm 0.05 $ & 6.2 & 9 & 21 & BnA & $<$4. & \\ & AM305 & 1990-07-05 & 80& 2007+404 & $2.84 \pm 0.02 $ & 4.9 & 5 & 26 & BnA & $<$2.8 & $2\times 25$ \\ & AFTST & 1991-08-11 & 21& 2052+365 & $5.15 \pm 0.01 $ & 6.0 & 38 & 19 & A & $<$5. & \\ & AW311 & 1992-03-15 & 21& 2022+542 & $1.036\pm 0.002$ & 13.2 & 29 & 27 & C & $<$5. & S \\ & TST6CM & 1993-06-04 & 9 & 2052+365 & $6.4 \pm 0.3 $ & 6.0 & 13 & 27 & CnB & $<$4. & S \\ & AL372 & 1996-03-28 & 5 & 2038+513 & 5.80 & 10.1 & 10 & 25 & C & $<$3.0 & S,~PH \\ & & & & & & & & & & & $2\times 3.125$ \\ & AA237 & 1999-02-01 & J2& 2052+365 & 5.31 $\pm$ 0.03 & 6.1 & 11 & 27 & C & $<$4. & \\ \hline \end{tabular} \tablefoot{ Column (1) gives the programme name; (2) the date of the observation; (3) the source on which the observation was centred; (4) the phase calibrator name (J2000 coordinates); (5) the phase calibrator flux; and (6) distance to the observation centre; (7) the integration time on the source; (8) the number of antennas that gave a usable signal; (9) the configuration the VLA was in at the time of the observation; (10) the measured flux; and (11) refers to the notes. Many of the VLA observations were made in two sidebands, each of which has a bandwidth of 50 MHz; the exceptions are noted in Col.~(11). Upper limits are 3 $\times$ the rms. \\ The details of Col.~(3) are: the source on which the observation was centred is mostly indicated by \citet{1956ApJ...124..530S} Cyg~OB2 numbers. Other indicators are: ``98'' is in between Cyg~OB2 No.~8A and No.~9; ``+'' is listed in the observing log as 2031+411; ``80'' as F80XF, ``21'' as 2032+41; ``J2'' as 2033+4118\_2 and ``SE'' as TEVSE. \\ The notes in Col.~(11) are: ``$1\times 50$'' (or a similar code): bandwidth different from standard $2\times 50$~MHz; ``I'': stripes are visible on this image, complicating the flux measurement; ``PH'': flux calibration on phase calibrator; ``S'': selfcalibration applied; ``X'': flux calibration is very uncertain; check on flux of phase calibrator suggests a factor of 2 uncertainty. Column (11) also gives references for those observations that have already been published in the literature: \tablefoottext{a}{\citet{1989ApJ...340..518B};} \tablefoottext{b}{\citet{1998ApJS..118..217W};} \tablefoottext{c}{\citet{2006AetA...454..625P}}. } \end{table}