\documentclass[]{aa}     
\begin{document}
 

\begin{table*}
\caption{Program star (v), Mean epoch of observation (1900.0 +), comparison 
(c) and check (ck) stars, standard deviations (in millimagnitudes) for the v-c 
($\sigma_v$) and ck-c ($\sigma_{ck}$) V-band differential magnitudes for 
each series of N nights, peak-to-peak ($\Delta$V) amplitude of the 
V-band light curve (in magnitudes) and period (P) of variability}
\renewcommand{\arraystretch}{.8}
\begin{tabular}{|ll|c|l|l|c|c|c|c|l|}
\hline
\multicolumn{2}{|c|}{Program star} & Epoch & \multicolumn{1}{|c}{Comparison} & 
\multicolumn{1}{|c|}{Check} & $\sigma_v$ & $\sigma_{ck}$ & N & 
$\Delta V$ & \multicolumn{1}{c|}{P} \\
\multicolumn{2}{|c|}{(v)} & & \multicolumn{1}{|c|}{(c)} & 
\multicolumn{1}{|c|}{(ck)} & & & & & 
\multicolumn{1}{|c|}{(days)} \\
\hline
\object{HD 7172}      &                    &93.02&\object{HD 7270}   &
                      \object{HD 7629}   & 22& 5& 13&.07&  3.15 \\
                      &           &93.91&\object{HD 7220}   &
                      \object{HD 7629}   & 15& 6& 12&.05&  3.20 \\
\object{HD 8357}      &= \object{AR Psc}   &90.83&\object{HD 7446}   &
                      \object{HD 7918}   & 33& 7& 14&.09& 12.56 \\
                      &                    &91.82&                   &
                                         & 21& 6& 11&.07& 12.14 \\
                      &                    &92.00&                   &
                                         & 39& 6& 11&.11& 12.20 \\
                      &                    &92.85&                   &
                                         & 18& 5& 20&.06& 12.26 \\
                      &                    &93.03&                   &
                                         & 30& 6& 17&.09& 12.38 \\
                      &                    &93.87&                   &
                                         & 29& 5& 28&.09& 12.19 \\
\object{HD 8358}      &= \object{BI Cet}   &93.02&\object{HD 8405}   &
                      \object{HD 8615}   & 26& 5& 13&.09& 0.5195 \\
                      &                    &93.99&                   &
                                         & 18&10&  8&.05& 0.5314 \\
\object{HD 16157}     &= \object{CC Eri}   &93.02&\object{HD 16371}  &
                      \object{SAO 215945}& 23& 7& 11&.07& 1.56145\\
                      &                    &93.91&                   &
                                         & 27& 5& 11&.08& 1.56145\\
\object{SAO 130113}   &= \object{BY Cet}   &92.98&\object{SAO 130102}&
                      \object{HD 16708}  & 38& 4& 17&.12& 2.60  \\
                      &                    &93.97&                   &
                      \object{HD 16619}  & 30& 6& 15&.09& 2.61  \\
\object{HD 17925}     &= \object{EP Eri}   &93.02&\object{HD 18511}  &
                      \object{HD 18183}  &  4& 2&  7&.01& --    \\
\object{HD 20629}     &= \object{XX Ari}   &92.99&\object{HD 21335}  &
                      \object{HD 20512}  & 37& 4& 26&.11& 2.4997\\
                      &                    &93.94&                   &
                      \object{HD 22072}  & 37&10& 11&.11& 2.4997\\
\object{HD 26354}     &= \object{AG Dor}   &93.02&\object{HD 26779}  &
                      \object{HD 27274}  & 10& 5& 11&.03& 2.533 \\
\object{HD 32918}     &= \object{YY Men}   &93.02&\object{HD 33763}  &
                      \object{HD 33747}  & 60& 3& 15&.17& 9.5476\\
\object{1E 0505-0527} &= \object{EZ Eri}   &93.02&\object{HD 33725}  &
                      \object{HD 34673}  & 14& 4&  8&.04& 9.08  \\
\object{HD 293857}    &                    &93.02&\object{HD 33725}  &
                      \object{HD 34673}  &  5& 4&  7&.01& --    \\
\object{HD 34802}     &= \object{YZ Men}   &93.02&\object{HD 34297}  &
                      \object{HD 33563}  & 32& 5& 15&.09& 19.310\\
\object{HD 35850}     &                    &93.02&\object{HD 36379}  &
                      \object{HD 35591}  &  2& 2&  4&-- & --    \\
\object{EXO 0527-3329}&= \object{UX Col}   &93.02&\object{SAO 195800}&
                      \object{HD 35322}  & 24& 7& 14&.10& 2.29  \\
\object{HD 36705}     &= \object{AB Dor}   &93.02&\object{HD 35230}  &
                      \object{HD 36316}  &  8& 5&  8&.03& 0.51479\\
\object{EXO 0532-0510}&= \object{V1321 Ori}&93.02&\object{HD 294257} &
                      \object{HD 36560}  & 58& 6& 16&.18& 5.7   \\
\object{HD 37824}     &= \object{V1149 Ori}&90.92&\object{HD 37741}  &
                      \object{HD 38529}  & 50& 7& 19&.13& 49.13 \\
                      &                    &91.15&                   &
                                         & 36& 8& 14&.11& 49.13 \\
                      &                    &91.86&                   &          
                                         & 62& 7& 22&.19& 49.07 \\
                      &                    &92.80&                   &          
                                         & 69&10& 19&.22& 50.81 \\
                      &                    &93.01&                   &          
                                         & 42&10& 31&.16& 50.81 \\
                      &                    &93.83&                   &          
                                         & 42& 7& 26&.15& 54.23 \\
                      &                    &94.06&                   &          
                                         & 38& 7& 20&.13& 54.23 \\
\object{HD 37847}     &= \object{TW Lep}   &93.02&\object{HD 37653}  &
                      \object{SAO 170680}& 20& 4& 11&.05& 28.22 \\
\object{HD 39917}     &= \object{SZ Pic}   &93.02&\object{HD 39901}  &
                      \object{HD 39962}  & 42& 5& 12&.15& 4.905 \\
\object{EXO 0556-3804}&= \object{TY Col}   &93.02&\object{HD 40865}  &
                      \object{HD 39601}  & 20& 5& 13&.06& 3.82  \\
\object{HD 61245}     &= \object{V344 Pup} &93.02&\object{HD 61390}  &
                      \object{HD 60574}  & 13& 4& 11&.05& 11.761\\
\object{HD 72688}     &= \object{VX Pyx}   &93.02&\object{HD 73089}  &
                      \object{HD 72673}  &  4& 5&  9&.02& 19.34 \\
\object{HD 78423}     &                    &93.02&\object{HD 77640}  &
                      \object{HD 78612}  & 10& 4&  4&.03& ?     \\
\object{HD 81410}     &= \object{IL Hya}   &93.02&\object{HD 81904}  &
                      \object{HD 80991}  & 61& 4& 14&.19&12.90522\\
\object{HD 82558}     &= \object{LQ Hya}   &93.02&\object{HD 82508}  &
                      \object{HD 82477}  & 19&10& 12&.07& 1.63  \\
\object{HD 98712}     &= \object{SZ Crt}   &93.02&\object{HD 97977}  &
                      \object{HD 98251}  &  9& 7& 11&.03& 11.58 \\
\object{SAO 202618}   &= \object{V858 Cen} &93.02&\object{HD 100912} &
                      \object{HD 101679} & 21& 5& 13&.06&1.043602\\
\object{HD 101309}    &= \object{V829 Cen} &93.02&\object{HD 101679} &
                      \object{HD 101614} & 30& 3& 15&.11& 11.65 \\
\object{HD 106225}    &= \object{HU Vir}   &93.02&\object{HD 106270} &
                      \object{HD 105796} & 44& 4& 13&.15& 10.424 \\
\object{HD 119285}    &= \object{V851 Cen} &93.02&\object{HD 119164} &
                      \object{HD 119076} &  9& 2&  7&.03& 12.05  \\
\object{HD 197481}    &= \object{AU Mic}   &93.91&\object{HD 197237} &
                      \object{HD 197339} & 73& 5&  9&.22& 4.865  \\
\hline
\end{tabular}
\end{table*}



\begin{table}
\caption{Mean atmospheric extinction coefficients for La Silla site, 
obtained over the intervals 31 December 1992 - 18 January 1993 (1993.02) and 
20 November - 03 December 1993 (1993.91)}
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline
            & Epoch   &  U  &  B  &  V  &  R  &  I  \\
\hline
mag/airmass & 1993.02 &.522 &.294 &.203 &.163 &.117 \\
mag/airmass & 1993.91 &.429 &.210 &.128 &.088 &.058 \\
\hline
\end{tabular}
\end{table}



\begin{table*}
\caption{Maximum luminosity ({\it V$_m$}) and corresponding colours measured 
for the program stars at the given Epoch (1900.0+), inferred spectral 
classification (Spectral Type), distance measured by the Hipparcos 
satellite (D$_H$), photometric distance inferred from the adopted spectral 
classification (d$_{ph}$) and V-band maximum luminosity ever observed 
({\it V$_{max}$})}
\renewcommand{\arraystretch}{.8}
\small
\begin{tabular}{|l|c|r|l|l|l|l|l|r|r|r|}
\hline
\multicolumn{1}{|c|}{Program Star} & Epoch &
\multicolumn{1}{|c|}{V$_m$} & \multicolumn{1}{|c|}{U$-$B~} & 
\multicolumn{1}{|c|}{B$-$V~} & \multicolumn{1}{|c|}{V$-$R} & 
\multicolumn{1}{|c|}{V$-$I} & \multicolumn{1}{c|}{Spectral Type} & 
\multicolumn{1}{|c|}{D$_H$} & \multicolumn{1}{c|}{d$_{ph}$} & 
\multicolumn{1}{|c|}{V$_{max}$} \\
\hline
\object{HD 7172}
        &93.02&9.66&0.04&0.63&0.35&0.68& G2/3~V       & $>$27  & 100 & 9.64 \\
        &93.91&9.64&0.05&0.63&0.34&0.68&              &        &     &      \\
\object{AR Psc}
        &90.83&7.30&0.37&0.83&    &    &K1~IV/V + G5/6~V&  45  &  46 & 7.24 \\
        &91.82&7.34&    &0.82&    &    &              &        &     &      \\
        &92.00&7.30&0.36&0.84&    &    &              &        &     &      \\
        &92.85&7.31&0.38&0.83&    &    &              &        &     &      \\
        &93.03&7.29&0.37&0.85&0.50&1.01&              &        &     &      \\
        &93.87&7.29&0.37&0.83&    &    &              &        &     &      \\
\object{BI Cet}
        &93.02&8.18&0.16&0.71&0.42&0.85&G6~V/IV + G6~V/IV& 66  &  65 & 8.08 \\
        &93.99&8.28&0.21&0.72&    &    &              &        &     &      \\
\object{CC Eri}
        &93.02&8.82&1.12&1.37&0.88&1.85& K7~V + M3~V  &  11.5  & 11.5& 8.70 \\
        &93.91&8.80&1.10&1.38&0.87&1.84&              &        &     &      \\
\object{BY Cet}  
        &92.98&9.54&0.28&0.78&0.48&0.94& G7~V + K5:~V & $>$23  &  76 & 9.54 \\
        &93.97&9.59&0.29&0.79&0.48&0.94&              &        &     &      \\
\object{EP Eri}
        &93.02&6.05&0.58&0.87&0.49&0.91& K0/1~V       &  10.4  &  10 & 6.00 \\
\object{XX Ari}
        &92.99&7.34&-.41&-.05&-.01&-.03& B9~V SiCr    &   238  & 257 & 7.34 \\
\object{AG Dor}
        &93.02&8.55&0.63&0.91&0.54&1.03& K1~V + K5~V  &    35  &  35 & 8.55 \\
\object{YY Men}  
        &93.02&7.99&0.70&1.04&0.58&1.14& K1~III       &   292  & 219 & 7.93 \\
\object{EZ Eri}  
        &93.02&10.17&0.53&0.91&0.51&1.00&K2~IV + G2~V &        & 290 &10.17 \\
\object{HD 293857}
        &93.02&9.26&0.24&0.73&0.42&0.82& G7~V         &    53  &  61 & 9.26 \\
\object{YZ Men}
        &93.02&7.75&0.78&1.09&0.61&1.17& K1~III       &   180  & 185 & 7.52 \\
\object{HD 35850}
        &93.02&6.30&0.03&0.55&0.33&0.62& F8/9~V       &   26.8 &  29 & 6.29 \\
\object{UX Col}
        &93.02&10.50&0.81&1.06&0.64&1.24& K3/5 PMS    &        &$>$43&10.50 \\
\object{AB Dor}  
        &93.02&6.86&0.39&0.83&0.49&0.96& K0~V         &   14.9 &  15 & 6.75 \\
\object{V1321 Ori}
        &93.02&10.62&0.85&1.25&0.74&1.45& K3~wTTS     &        &500: &10.50 \\
\object{V1149 Ori}
        &90.92&6.78&0.94&1.12 &    &    & K2/3~III +F8~V&144   & 126 & 6.59 \\
        &91.15&6.80&0.92&1.13 &    &    &             &        &     &      \\
        &91.86&6.77&    &1.12 &    &    &             &        &     &      \\
        &92.80&6.75&0.94&1.13 &    &    &             &        &     &      \\
        &93.01&6.75&0.94&1.14 &0.63&1.18&             &        &     &      \\
        &93.83&6.81&0.96&1.14 &    &    &             &        &     &      \\
        &94.06&6.80&0.96&1.13 &    &    &             &        &     &      \\
\object{TW Lep}
        &93.02&7.35&0.74&1.06 &0.60&1.16& K2/3~III + F6~IV&170 & 177 & 7.27 \\
\object{SZ Pic}
        &93.02&7.81&0.31&0.81&0.46&0.90& K0~IV/III + G3~IV/III&195&190&7.81 \\
\object{TY Col}
        &93.02&9.56&0.17&0.69 &0.42&0.82& G5~V PMS    &        &$>$83& 9.53 \\
\object{V344 Pup}
        &93.02&6.89&0.82&1.04&0.56&1.06& K1~IV/III    &    111 & 102 & 6.85 \\
\object{VX Pyx}
        &93.02&6.36&0.68&0.95&0.49&0.94& K0~III + F6~IV&   131 & 117 & 6.32 \\
\object{HD 78423}
        &93.02&7.82&0.00&0.04&0.01&0.03& A1/2~III:    &    345 & 334:& 7.82 \\
\object{IL Hya}
        &93.02&7.24&0.73&1.02&0.56&1.08& K1~III/IV + ?&    120 & 119 & 7.20 \\
\object{LQ Hya}
        &93.02&7.78&0.56&0.91&0.53&1.02& K2~V         &   18.3 &18.5 & 7.77 \\
\object{SZ Crt}
        &93.02&8.62&1.19&1.33&0.84&1.67& K7~V + M2/3~V&   13.2 &  12 & 8.59 \\
\object{V858 Cen}
        &93.02&10.52&0.54&0.90&0.54&1.08& K1~V/IV + M5:V&      &  94 &10.50 \\
\object{V829 Cen}
        &93.02&7.80&0.48&0.92&0.54&1.05& K1~IV + G5~V &    122 & 127 & 7.80 \\
\object{HU Vir}
        &93.02&8.70&0.61&1.00&0.58&1.14& K1~IV + ?    &    125 & 170 & 8.55 \\
\object{V851 Cen}
        &93.02&7.67&0.80&1.08&0.62&1.20& K3~IV/V      &     76 &  76 & 7.62 \\
\object{AU Mic}  
        &93.91&8.59&1.10&1.47&0.95&2.01& M1~Ve        &    9.9 & 7.6 & 8.59 \\
\hline
\end{tabular}
\end{table*}



\begin{table*}
\caption{{\it V} magnitude and colours for the c and ck stars obtained at ESO. 
Errors are of the order of 0.01 magnitudes. The symbol ":" denotes errors of 
the order of 0.02 magnitudes; the epochs of observation are given in Table\,1}
\renewcommand{\arraystretch}{.8}
\begin{tabular}{|l|c|r|c|c|c||l|c|r|c|c|c|}
\hline
\multicolumn{1}{|c|}{c or ck} & V & \multicolumn{1}{|c|}{U$-$B} & B$-$V & 
V$-$R & V$-$I & \multicolumn{1}{|c|}{c or ck} & V & 
\multicolumn{1}{|c|}{U$-$B} & B$-$V & V$-$R & V$-$I \\
\hline
\object{HD 7220}   &8.42&1.08:&1.13&0.57&1.08& 
\object{HD 36560}  &8.26&-.35 &-.08&-.03&-.08 \\
                   &8.42&1.08:&1.13&0.57&1.08& 
\object{HD 36316}  &7.95&1.74 &1.46&0.79&1.51 \\
\object{HD 7446}   &6.04&1.05:&1.08&0.54&1.02& 
\object{HD 294257} &9.81&0.03 &0.48&0.29&0.56 \\
\object{HD 7629}   &7.13&0.04:&0.31&0.18&0.36& 
\object{HD 37653}  &8.24&0.50:&0.88&0.48&0.93 \\
                   &7.14&0.05:&0.30&0.17&0.36& 
\object{HD 37741}  &8.20&0.91:&1.07&0.57&1.06 \\
\object{HD 7918}   &8.01&1.02:&1.11&0.56&1.07& 
\object{SAO 170680}&8.96&0.91:&1.04&0.53&1.01 \\
\object{HD 8405}   &9.14&0.64 &0.96&0.50&0.98& 
\object{HD 38529}  &5.93&0.45:&0.77&0.42&0.76 \\
\object{HD 8615}   &8.88&0.81:&1.03&0.53&1.03& 
\object{HD 39601}  &8.17&0.29 &0.79&0.44&0.86 \\
\object{SAO 215945}&9.73&-.03:&0.38&0.24&0.45& 
\object{HD 39901}  &6.55&1.64:&1.37&0.70&1.32 \\
                   &9.72&-.03:&0.38&0.21&0.45& 
\object{HD 39962}  &7.97&-.05:&0.40&0.25&0.50 \\
\object{HD 16371}  &8.09&0.56:&0.90&0.48&0.93& 
\object{HD 40865}  &8.62&0.06 &0.63&0.36&0.70 \\
                   &8.09&0.54:&0.90&0.47&0.93& 
\object{HD 60574}  &6.53&0.56 &0.92&0.49&0.95 \\
\object{HD 16619}  &7.82&0.14:&0.66&0.36&0.70& 
\object{HD 61390}  &7.92&0.72 &1.01&0.53&1.03 \\
\object{HD 16708}  &7.07&0.72:&1.01&0.53&1.02& 
\object{HD 72673}  &6.38&0.35:&0.78&0.43&0.84 \\
\object{SAO 130102}&10.11&0.08:&0.60&0.34&0.65&
\object{HD 73089}  &6.70&1.59:&1.38&0.71&1.37 \\
                   &10.11&0.08:&0.60&0.33&0.64& 
\object{HD 77640}  &6.82&-.19 &-.05&-.03&-.06 \\
\object{HD 18511}  &6.52&0.82:&1.03&0.54&1.04& 
\object{HD 78612}  &7.16&0.07 &0.63&0.33&0.67 \\
\object{HD 18183}  &7.08&0.09:&0.33&0.21&0.41& 
\object{HD 80991}  &8.50&0.83:&1.04&0.53&1.02 \\
\object{HD 20512}  &7.42&0.41:&0.79&0.44&0.85& 
\object{HD 81904}  &8.02&0.71:&0.98&0.51&0.98 \\
\object{HD 21335}  &6.54&0.06:&0.17&0.10&0.21& 
\object{HD 82477}  &6.13&1.18 &1.19&0.62&1.17 \\
\object{HD 26779}  &8.58&1.26:&1.23&0.63&1.19& 
\object{HD 82508}  &7.58&0.35 &0.71&0.41&0.80 \\
\object{HD 27274}  &7.64&1.11:&1.12&0.68&1.22& 
\object{HD 97977}  &8.85&1.67 &1.42&0.75&1.43 \\
\object{HD 33563}  &7.53&-.04:&0.49&0.30&0.58& 
\object{HD 98251}  &9.21&1.49 &1.31&0.69&1.30 \\
\object{HD 33725}  &8.04&0.44:&0.80&0.44&0.84& 
\object{HD 100912} &8.63&0.44 &0.93&0.51&1.02 \\
\object{HD 33747}  &8.76&0.74:&0.98&0.52&1.01& 
\object{HD 101614} &6.86&0.02 &0.58&0.34&0.67 \\
\object{HD 33763}  &8.38&0.50:&0.89&0.48&0.94& 
\object{HD 101679} &8.11&0.81 &1.09&0.59&1.15 \\
\object{HD 34297}  &7.33&0.07:&0.65&0.38&0.74& 
\object{HD 105796} &8.07&0.94:&1.06&0.56&1.05 \\
\object{HD 34673}  &7.77&0.93:&1.04&0.63&1.21& 
\object{HD 106270} &7.60&0.30:&0.73&0.41&0.78 \\
\object{HD 35230}  &7.58&0.48 &0.88&0.48&0.93& 
\object{HD 119076} &6.87&0.90 &1.16&0.61&1.15 \\
\object{HD 35322}  &8.42&-.03:&0.41&0.26&0.49& 
\object{HD 119164} &7.20&1.15 &1.29&0.65&1.23 \\
\object{HD 35591}  &6.54&1.05:&1.09&0.55&1.01& 
\object{HD 197237} &9.00&0.83:&0.99&0.51&0.97 \\
\object{SAO 195800}&9.17&0.37:&0.84&0.47&0.92& 
\object{HD 197339} &7.40&1.43:&1.30&0.66&1.23 \\
\object{HD 36379}  &6.94&0.03:&0.56&0.33&0.63&           
                   &    &     &    &    &     \\
\hline
\end{tabular}
\end{table*}



\begin{table*}
\caption{Revised spectral classification, based on the latest version of the 
ASC method, for some active stars previously observed by our group; the
previous classification and the corresponding reference, the distance range 
measured by the Hipparcos satellite (D$_H$) and the photometric distance 
inferred from the adopted spectral classification (d$_{ph}$) are also listed}
\renewcommand{\arraystretch}{.8}
\small
\begin{tabular}{|l|l|lc|l|r|}
\hline
\multicolumn{1}{|c|}{Program Star} & 
\multicolumn{1}{|c|}{Revised classification} & 
\multicolumn{1}{|c}{Previous classification} & \multicolumn{1}{c|}{Reference} &
\multicolumn{1}{|c|}{D$_H$} & \multicolumn{1}{c|}{d$_{ph}$} \\
\hline
\object{HD 17144} = \object{UY For}
        & K2/3 III      & K2/3 III + F6 V & A & 202 - 382   & 258 \\
\object{HD 26913} = \object{V891 Tau}
        & G5 V          & G5/6 IV/V       & A & 20.4 - 21.4 &  25 \\
\object{HD 31738} = \object{V1198 Ori}
        & G5/6 IV/V + ? & G6 IV + G1V     & B & 32 - 35     &  39 \\
\object{HD 46697} = \object{TZ Pic}   
        & K1 III        & K2 III/IV       & B & 159 - 196   & 120 \\
\object{HD 71071} = \object{LU Hya}   
        & K1 IV/V       & K1 IV + G5 V ?  & C & 47 - 52     &  41 \\
\object{HD 117860}    
        & G3 V          & G3/4 V          & D & 31 - 33     &  34 \\
\object{HD 147633}  
        & G2/3 V + G4 V & K0 IV + F2/3 V  & D & 40 - 52     &  47 \\
\object{HD 159808}
        & F4/5 V + F5 V & F6 V            & D & 118 - 196   & 125 \\
\object{HD 170196}   
        & B9 III        & B9 V            & D & 394 - 1190  & 485 \\
\object{HD 217344} = \object{TZ PsA}
        & G5 V + K3 V + K9:V& G5/6 IV + ? & E & 59 - 74     &  56 \\
\object{HD 218515}   
        & A0/1 V        & A1/2 V          & D & 178 - 265   & 222 \\
\object{HD 219025} = \object{BI Ind}
        & K3 III + K1 IV/III& K3 III + F4 V&B & 246 - 410   & 272 \\
\object{HD 220096}           
        & G4 III        & G8 IV           & D & 93 - 110    &  90 \\
\hline
\end{tabular}
~\\
References: A = A\&AS 89,435; B = A\&AS 111,507; C = A\&AS 102,655; 
D = A\&AS 115,41; A\&AS 121,369
\end{table*}


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