\begin{table}%t3 \caption{\label{twhya}{TW Hydrae association}.} %\centering \par \begin{tabular}{llllccclllllc} \hline\hline \noalign{\smallskip} Name & ID$_{\rm ASAS}$ & $P$ & $\Delta P$ & Timeseries & $\Delta V_{\rm max}$ & $\sigma_{\rm acc}$ & $V_{\min}$ & $B - V$ & Sp.T. & Mult. & Note & Variable's \\ & & (d) & (d) & sections & (mag) & (mag) & (mag) & (mag) & & & & name \\ \hline TW~Hya & 110152--3442.3 & 2.80 & 0.04 & ... & 0.25 & 0.031 & 11.00 & 0.97 & K6Ve & S & $P_{\rm lit}$ & \\ TWA~2 & 110914--3001.7 & 4.86 & 0.02 & 13/16 & 0.18 & 0.031 & 11.10 & 1.48 & M2Ve & V & new & \\ TWA~3A & 111028--3731.9 & ... & ... & ... & ... & ... & 12.10 & 1.47 & M4Ve & V & ...& \\ TWA~3B & no-ASAS & .. & ... & ... & ... & ... & 13.07 & 1.52 & M4Ve & V & ...& \\ TWA~4A & 112205--2446.7 & 2.52 & 0.20 & ... & 0.09 & ... & 8.94 & 1.17 & K5V & Q & $P_{\rm lit}$ & TV Crt\\ TWA~4B & 112205--2446.7 & 14.8 & 0.3 & 9/14 & 0.09 & 0.032 & 8.92 & 1.17 & K5V & Q & new & \\ TWA~5 & 113155--3436.5 & 0.776 & 0.001 & 2/15 & 0.22 & 0.031 & 11.56 & 1.47 & M2Ve & T & $P=P_{\rm ACVS}$& \\ TWA~6\tablefootmark{a} & 101829--3150.0 & 0.54 & ... & ... & 0.49 & ... & 10.88 & 1.31 & M0Ve & S & $P_{\rm lit}$& \\ TWA~7 & 104230--3340.3 & 5.00\tablefootmark{b} & 0.03 & 1/15 & 0.11 & 0.030 & 11.73 & 1.46 & M2Ve & S & $P=P_{\rm lit}$& \\ TWA~8A & 113241-2651.9 & 4.66 & 0.06 & 4/14 & 0.27 & 0.029 & 12.14 & 1.46 & M3Ve & V & $P=P_{\rm lit}$ & \\ TWA~8B & no-ASAS & 0.78 & ... & ... & 0.08 & ... & 15.20 & 1.10 & M5 & V & $P_{\rm lit}$ & \\ TWA~9A & 114824-3728.8 & 5.01 & 0.01 & 13/14 & 0.18 & 0.027 & 11.22 & 1.26 & K5V & V & $P\ne P_{\rm ACVS}$; $P=P_{\rm lit}$& \\ TWA~9B & no-ASAS & 3.980 & ... & ... & 0.08 & ... & 14.00 & 1.43 & M1V & V & $P_{\rm lit}$ & \\ TWA~10 & 123504--4136.6 & 8.4 & 0.1 & 2/14 & 0.33 & 0.027 & 13.04 & 1.43 & M2Ve & S & $P=P_{\rm lit}$& \\ TWA~12\tablefootmark{a} & 112105--3845.3 & 3.30 & 0.01 & 7/14 & 0.45 & 0.030 & 12.70 & 1.53 & M1Ve & S & $P=P_{\rm ACVS}=P_{\rm lit}$& \\ TWA~13A & 112117--3446.8 & 5.56 & 0.03 & 8/15 & 0.20 & 0.031 & 11.09 & 1.42 & M1Ve & V & =1/2 $P_{\rm ACVS}$; $P=P_{\rm lit}$& \\ TWA~13B & 112117--3446.8 & 5.35 & 0.03 & 4/12. & 0.27 & 0.031. & 11.96 & 1.47 & M5 & V & $P=P_{\rm lit}$ & \\ TWA~14\tablefootmark{a} & 111326--4523.7 & 0.63 & ... & ... & 0.11 & ... & 12.52 & 1.30\tablefootmark{1} & M0 & S & $P_{\rm lit}$& \\ TWA~15A\tablefootmark{a}& 123421--4815.2 & 0.65 & ... & ... & 0.13 & ... & ... & 1.45\tablefootmark{1} & M2 & V & $P_{\rm lit}$ & \\ TWA~15B\tablefootmark{a}& 123420--4815.3 & 0.72 & ... & ... & 0.05 & ... & ... & 1.45\tablefootmark{1} & M2 & V & $P_{\rm lit}$& \\ TWA~16\tablefootmark{a} & 123456--4538.1 & ... & ... & ... & ... & ... & 12.69 & & M1.5 & B & ...& \\ TWA~17\tablefootmark{a} & 132045--4611.6 & 0.69 & ... & ... & 0.12 & ... & ... & 1.20\tablefootmark{1} & K5 & S & P$_{\rm lit}$& \\ TWA~18\tablefootmark{a} & 132137--4421.9 & 1.11 & ... & ... & 0.08 & 0.030 & 13.12 & 1.30\tablefootmark{1} & M0.5 & S & P$_{\rm lit}$ & \\ TWA~19AB\tablefootmark{a} & 114721--4953.1 & ... & ... & ... & ... & ... & ... & ... & K7 & V & ...& \\ TWA~20 & 123138--4559.0 & ... & ... & ... & ... & ... & 13.42 & 1.10 & M2 & S & ...& \\ TWA~21\tablefootmark{a} & 101315--5230.9 & 4.43 & 0.02 & 7/15 & 0.13 & 0.037 & 9.82 & 1.00 & K3Ve & V & new & \\ TWA~23\tablefootmark{e} & 120727--3247.0 & ... & ... & ... & ... & ... & 12.81 & 1.35\tablefootmark{1} & M1 & S & ... & \\ TWA~24\tablefootmark{a} & 120942--5854.8 & 0.680\tablefootmark{b} & 0.004 & 6/12 & 0.08 & 0.030 & 10.28 & 0.94 & K1Ve & S & new& \\ TWA~25 & 121531--3948.7 & 5.07 & 0.02 & 12/14 & 0.23 & 0.032 & 11.37 & 1.41 & M1Ve & S & $P=P_{\rm ACVS}$& \\ \hline \end{tabular} \tablefoot{V~=~visual companion; S~=~single star; B~=~binary system; T~=~triple system; Q~=~quadruple system; $P_{\rm lit}$: period as given in the literature; $P_{\rm ACVS}$: period in ACVS; \tablefoottext{a}{rejected member and excluded from rotation period distribution;} \tablefoottext{b}{period undetected in the periodogram of the complete time series;} \tablefoottext{e}{not included in the member list because of incomplete kinematic information;} \tablefoottext{1}{inferred from spectral type. Summary of period searches: Star's name; ASAS number; rotation period and its uncertainty; fraction of timeseries sections in which the rotation period is detected with confidence level higher than 99\%; maximum light curve amplitude ($\Delta V_{\rm max}$); photometric accuracy ($\sigma_{\rm acc}$); brightest $V$~magnitude ($V_{\min}$); $B - V$~colour; spectral type and note on binarity; note on period, and variable star designation if it exists. Targets are listed according to increasing TWA number (and increasing ASAS number for the other associations). }} \end{table}