\begin{table}%t1 \caption{\label{Log}Log of objects observed in the direction of M~31 and derived spectral types.} \par \small%\centerline { \begin{tabular}{llllllllllll} \hline\hline \multicolumn{12}{c}{{M~31}}\\ {ID}$^1$ & {RA} & {Dec} & \multicolumn{3}{c} {USNO-B1} & \multicolumn{3}{c}{2MASS} & {date} & {Exp.} & {spectral} \\ &(2000)&(2000)&{ID}&{$B$}&{$R$}&{ID}&{$J$ }&$K$&&{(s)}&{type}\\ \hline 40 & 00 40 07.29 & 40 41 41.2 & 1306-0011378 & 16.1 & 14.3 & 00400722+4041428 & 13.55 & 13.16 & 29/09/07 & 7200 (4) & G2 \\ 42 & 00 40 07.71 & 40 31 12.3 & 1305-0011632 & 13.5 & 12.1 & 00400757+4031134 & 12.18 & 11.85 & 12/09/07 & 3600 (2) & F8 \\ 78 & 00 40 40.16 & 40 25 50.9 & 1304-0011697 & 14.4 & 14.2 & 00404007+4025532 & 13.15 & 12.79 & 14/09/07 & 7200 (4) & G0 \\ 100 & 00 40 54.54 & 40 31 32.7 & 1305-0012214 & 14.4 & 14.1 & 00405458+4031303 & 13.12 & 12.75 & 06/10/07 & 7200 (4) & F7 \\ 128 & 00 41 18.76 & 40 51 59.3 & 1308-001239 & 15.7 & 13.6 & 00411865+4051592 & 11.74 & 11.26 & 29/09/07 & 5400 (3) & G6 \\ 129 & 00 41 19.27 & 40 51 01.7 & 1308-0012400 & 13.8 & 13.9 & 00411911+4051017 & 12.01 & 11.48 & 05/10/07 & 5400 (3) & K0 \\ 273 & 00 42 29.43 & 41 29 03.0 & 1314-0013202 & 15.2 & 12.4 & 00422944+4129035 & 10.00 & 9.24 & 14/09/07 & 3600 (2) & K0 \\ 473 & 00 43 38.58 & 41 37 37.7 & 1316-0014855 & nf & 14.2 & 00433861+4137386 & 11.76 & 11.12 & 07/10/07 & 7200 (4) & K3 \\ 484 & 00 43 43.10 & 41 38 06.6 & 1316-0014885 & nf & 14.2 & 00434293+4138078 & 12.01 & 11.70 & 07/10/07 & 7200 (4) & F5 \\ 492 & 00 43 46.69 & 41 38 35.6 & 1316-0014901 & 16.1 & 14.1 & 00434663+4138360 & 11.55 & 11.00 & 07/10/07 & 7200 (4) & K2 \\ 593 & 00 44 53.31 & 42 02 15.8 & 1320-0014419 & 14.1 & 13.3 & 00445336+4202145 & 11.76 & 11.16 & 15/09/07 & 2800 (2) & K1 \\ 611 & 00 45 05.85 & 42 03 17.3 & 1320-0014588 & 13.5 & 13.1 & 00450551+4203177 & 11.80 & 11.45 & 27/09/07 & 5400 (3) & G2 \\ 662 & 00 45 38.97 & 41 56 17.3 & 1319-0014370 & 14.3 & 13.1 & 00453897+4156163 & 11.70 & 11.16 & 30/09/07 & 3600 (2) & K0 \\ 663 & 00 45 40.40 & 42 08 07.6 & 1321-0015992 & 13.9 & 11.5 & 00454053+4208066 & 10.46 & -- & 12/09/07 & 2400 (2) & K4 \\ 665 & 00 45 41.26 & 42 19 40.4 & 1323-0017116 & 13.2 & 12.4 & 00454112+4219440 & 11.48 & 11.14 & 15/09/07 & 3600 (2) & G0 \\ 701 & 00 46 03.09 & 42 24 34.6 & 1324-0016254 & 14.8 & 14.0 & 00460308+4224338 & 13.08 & 12.68 & 06/10/07 & 7200 (4) & F6 \\ 741 & 00 46 23.72 & 41 21 16.7 & 1313-0014047 & 14.6 & 13.7 & 00462372+4121172 & 12.58 & 12.21 & 30/09/07 & 5400 (3) & G0 \\ 766$^2$ & 00 46 37.75 & 41 29 05.3 & 1314-0014843 & 14.1 & 12.6 & 00463749+4129053 & 13.56 & 13.23 & 28/09/07 & 3600 (2) & G2 \\ & & & & & & 00463781+4129037 & 13.23 & 12.64 & 28/09/07 & 3600 (2) & K1 \\ 780 & 00 46 45.85 & 42 30 48.3 & 1325-0017703 & 14.2 & 12.8 & 00464627+4230478 & 11.74 & 11.33 & 27/09/07 & 3600 (2) & G2 \\ 840 & 00 47 26.05 & 42 21 58.9 & 1323-0018108 & 13.0 & 12.5 & 00472611+4221583 & 11.27 & 10.92 & 27/09/07 & 3600 (2) & G2 \\ \hline \end{tabular}} \medskip $^1$ X-ray source numbers from PFH2005 (M~31), i.e. the prefix $\rm [PFH2005]$ should be added in front of each number.\\ $^2$ The bright USNO-B1 star given as possible optical counterpart in PFH2005 (USNO-B1 1314-0014843) is actually resolved into two brighter stars on Skinakas images (and in 2MASS). \vspace*{-3mm} \end{table}