\begin{table}%t3
\caption{\label{popt}Summary of the temporal evolution in the optical polarization of the targets from the literature.}
%
\par
%\centerline
$$
\begin{tabular}{llrlr@{ (}lrr}
\hline \hline
Object &  Date/epoch & $\it{N}$  & Band  &  \multicolumn{2}{c}{$\it{P}^{a}$ (\%)} & PA$^{a}$ ($^\circ$)      &    Ref.  \\
\hline
\multicolumn{8}{c}{T Tauri}
\\
%%	HD 143006	&		&		&	\it{V}	&	 	&	 $)$	&	 	&	 	\\
	V895 Sco	&	1978/05	&	1	&	\it{V}	&	3.0	&	0.4$)$	&	165	&	1	\\
		&	1978/05	&	1	&	\it{R}	&	2.9	&	0.2$)$	&	173	&	1	\\
	AS 353A 	&	1976/07$-$1978/07	&	7	&	\it{V}	&	1.4	&	0.1$)$	&	145	&	1	\\
		&	1976/10$-$1978/07	&	6	&	\it{R}	&	1.3	&	0.02$)$	&	144	&	1	\\
		&	1986/08	&	1	&	\it{R}	&	1.4	&	0.2$)$	&	139	&	4	\\
		&	2000/05	&	1	&	\it{I}	&	1.4	&	0.04$)$	&	125	&	5	\\
	PX Vul	&	1998/07$-$1998/10	&	9	&	\it{V}	&	3.9	&	0.1$)$	&	28	&	2	\\
	V536 Aql	&	1977/08$-$1978/07	&	2	&	\it{V}	&	6.6	&	0.3$)$	&	67	&	1	\\
		&	1977/08$-$1978/07	&	2	&	\it{R}	&	5.5	&	0.5$)$	&	65	&	1	\\
		&	1985/06$-$1986/08	&	2	&	\it{R}	&	7.6	&	0.4$)$	&	43	&	4	\\
	RY Tau	&	1972/01	&	1	&	\it{V}	&	3.2	&	0.2$)$	&	30	&	9	\\
		&	1973/01	&	1	&	\it{V}	&	5.0	&	0.1$)$	&	20	&	9	\\
		&	1976/09$-$1978/12	&	16	&	\it{V}	&	2.5	&	0.2$)$	&	21	&	1	\\
%%		&	1976/11$-$1978/12	&	14	&	\it{R}	&	2.7	&	0.2$)$	&	19	&	1	\\
		&	1979/09	&	1	&	\it{V}	&	3.1	&	0.2$)$	&	18	&	8	\\
		&	1980/01	&	3	&	\it{V}	&	3.0	&	0.04$)$	&	18	&	6	\\
		&	1980/02	&	1	&	\it{V}	&	2.2	&	0.1$)$	&	39	&	8	\\
		&	1998/10$-$1999/01	&	7	&	\it{V}	&	2.6	&	0.1$)$	&	23	&	2	\\
		&	2001/12$-$2003/12	&	4	&	\it{R}	&	2.0	&	0.3$)$	&	13	&	10	\\
	DG Tau	&	1976/10$-$1978/10	&	3	&	\it{V}	&	5.5	&	0.1$)$	&	136	&	1	\\
		&	1976/10$-$1978/10	&	2	&	\it{R}	&	6.0	&	0.1$)$	&	135	&	1	\\
		&	1980/01	&	1	&	\it{V}	&	5.1	&	0.1$)$	&	137	&	6	\\
%%	DK Tau	&		&		&	\it{V}	&	 	&	 $)$	&	 	&	 	\\
	DO Tau	&	1976/10	&	1	&	\it{V}	&	3.1	&	0.2$)$	&	171	&	1	\\
		&	1976/10	&	1	&	\it{R}	&	2.9	&	0.1$)$	&	171	&	1	\\
		&	1980/01	&	1	&	\it{V}	&	3.8	&	0.3$)$	&	175	&	6	\\
	HL Tau	&	1976/10	&	1	&	\it{V}	&	8.3	&	0.4$)$	&	146	&	1	\\
		&	1976/10	&	1	&	\it{R}	&	11.2	&	0.2$)$	&	147	&	1	\\
		&	1980/01	&	1	&	\it{V}	&	13.5	&	0.8$)$	&	143	&	6	\\
		&	1985/01	&	1	&	\it{B}	&	13.7	&	0.3$)$	&	138	&	4	\\
		&	1987/01	&	1	&	\it{clear}	&	14.0	&	0.3$)$	&	143	&	11	\\
%%	XZ Tau	&		&	1	&	\it{V}	&	0.3	&	0.02$)$	&	129	&	2	\\
	LkH$\alpha$ 358	&	1987/01	&	1	&	\it{clear}	&	4.1	&	0.3$)$	&	6	&	11	\\
	UY Aur	&	1978/12/01	&	1	&	\it{V}	&	3.3	&	0.2$)$	&	127	&	1	\\
		&	1979/02/28	&	1	&	\it{V}	&	2.3	&	0.5$)$	&	162	&	1	\\
		&	1980/01/05	&	1	&	\it{V}	&	3.0	&	0.2$)$	&	161	&	6	\\
	RY Ori	&	1995/01/30	&	1	&	\it{V}	&	6.6	&	1.9$)$	&	165	&	7	\\
		&	1995/01/30	&	1	&	\it{V}	&	4.3	&	1.9$)$	&	41	&	7	\\
		&	1998/10$-$1999/02	&	7	&	\it{V}	&	2.7	&	0.1$)$	&	72	&	2	\\
\hline
\multicolumn{8}{c}{Herbig Ae/Be}
\\				 	
	PDS 406	&	1999/04/11	&	1	&	\it{V}	&	4.7	&	0.1$)$	&	34	&	3	\\
	Hen 3-1191	&	1999/04/11	&	1	&	\it{V}	&	5.9	&	0.2$)$	&	46	&	3	\\
%%																 	\\
	PDS 453	&	1999/04/08	&	1	&	\it{V}	&	3.6	&	0.1$)$	&	49	&	3	\\
	MWC 297	&	1973/10	&	1	&	\it{V}	&	1.4	&	0.2$)$	&	95	&	12	\\
		&	1975/08	&	1	&	\it{V}	&	1.9	&	0.1$)$	&	98	&	12	\\
		&	1976/06	&	1	&	\it{V}	&	1.8	&	0.1$)$	&	95	&	12	\\
		&	1985(6)	&	1	&	\it{V}	&	2.1	&	0.2$)$	&	91	&	13	\\
		&	1998/05	&	1	&	\it{V}	&	1.2	&	0.2$)$	&	95	&	2	\\
		&	1999/07/29	&	1	&	\it{V}	&	1.8	&	0.1$)$	&	94	&	3	\\
	VV Ser	&	1998/05$-$1998/10	&	11	&	\it{V}	&	1.7	&	0.1$)$	&	78	&	2	\\
		&	2000/06/22	&	1	&	\it{V}	&	1.8	&	0.1$)$	&	78	&	3	\\
	PDS 520	&	1999/07/28	&	1	&	\it{V}	&	3.5	&	0.1$)$	&	15	&	3	\\
	WW Vul	&	1987/08	&	3	&	\it{V}	&	5.3	&	0.6$)$	&	170	&	14	\\
		&	1998/05	&	3	&	\it{V}	&	0.6	&	0.1$)$	&	93	&	2	\\
		&	1998/07$-$1998/10	&	8	&	\it{V}	&	0.4	&	0.1$)$	&	146	&	2	\\
		&	2000/06/21	&	1	&	\it{V}	&	0.9	&	0.1$)$	&	151	&	3	\\
	VY Mon	&	1995/01$-$1995/02	&	7	&	\it{V}	&	8.7	&	0.7$)$	&	6	&	7	\\
		&	1998/10$-$1999/02	&	3	&	\it{V}	&	9.8	&	0.5$)$	&	5	&	2	\\
\hline																 	
%%	HD 139614	&		&	&		\it{V}	&	 	&	 $)$	&	 	&	 	\\
%%	HD 281159	&		&	&		\it{V}	&	 	&	 $)$	&	 	&	 	\\
%%	HD 23680	&		&	&		\it{V}	&	 	&	 $)$	&	 	&	 	\\
\end{tabular}$$
\medskip
\par
Errors in parenthesis. \\
$^{a}$ Mean values quoted when $\it{N}$ $>$ 1. \\
References: (1) Bastien~(\cite{bas82}), the $\sigma_{1}$ error is quoted for individual observations and $\sigma_{2}$ for mean values; for simplicity $\it{V}$ and $\it{R}$ bands refer to the filters centered in 5895~$\rm{\AA}$ and 7543~$\rm{\AA}$, respectively; only $\it{V}$ measurements for RY Tau and UY Aur are quoted; (2) Oudmaijer et~al.~(\cite{ou01}), only $\it{V}$ measurements are quoted;  (3) Rodrigues et~al.~(\cite{rod09}); (4) M\'enard \& Bastien~(\cite{men92}); (5) Monin et~al.~(\cite{mon06}); (6) Bastien~(\cite{bas85}), for simplicity $\it{B}$ refers to the filter centered in 4700~$\rm{\AA}$ and $\it{R}$ to the filters centered in 7640~$\rm{\AA}$ and 7675~$\rm{\AA}$; (7) Yudin \& Evans~(\cite{yud98}), only $V$ measurements are quoted; (8) Hough et~al.~(\cite{ho81}); (9) Breger~(\cite{bre74}), only $\it{V}$ measurements are quoted; (10) Vink et~al.~(\cite{vin05}); (11) Gledhill \& Scarrott~(\cite{gle89}); (12) Vrba et~al.~(\cite{vrb79}), only $\it{V}$ measurements are quoted; (13) Hillenbrand et~al.~(\cite{hil92}); (14) Grinin et~al.~(\cite{gri88}), mean polarization on the photometric deep minima is quoted.\\
\end{table}