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\begin{document}

%   \thesaurus{04.01.1; 08.14.2; 13.25.5}

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   \title{First optical identification of a supersoft X-ray source in M31}
  \authorrunning{Supersoft source in M31}

 \author{P. Nedialkov \inst{1,} \inst{2,} \inst{3}, M. Orio \inst{4,} \inst{5}, K. Birkle \inst{6},
C. Conselice \inst{7}, M. Della Valle \inst{8}, J. Greiner \inst{9}, 
E. Magnier \inst{10,} \inst{11}, N. A. Tikhonov \inst{12} } 
%
   \offprints{M. Orio}

   \institute{Department of Astronomy, Sofia University, Bulgaria
              \and Isaac Newton Institute of Chile, Bulgarian branch
              \and   japet@phys.uni-sofia.bg
              \and 
              INAF-Osservatorio Astronomico di Torino, Strada Osservatorio,
              20, I10025 Pino Torinese (TO), Italy
              \and
              Department of Astronomy, 474 N. Charter Str., Madison WI
              53706, USA
              \and
              Max-Planck-Institut f\"ur Astronomie, K\"onigstuhl, D-69117 Heidelberg, Germany 
              \and
              Department of Astronomy, Caltech, MC 105-24, Pasadena, CA 91125, USA
              \and
              Osservatorio Astronomico di Arcetri, Florence, Italy 
              \and
              Astrophysikalisches Institut, 14482 Potsdam, FRG
              \and
              University of Hawaii, Institute for Astronomy, 2680 Woodlawn Dr., Honolulu, HI 96822, USA
              \and
              Canada France Hawaii Corporation, PO Box 1597, Kamuela, HI 96743, USA 
      \and
      Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhnyj Arkhyz,  Russia}
\date{Received ; accepted }

%\authorrunning{Identification of a source in M31}

%   \maketitle
%
  \begin{table*}
  \caption[Table]{Photometry obtained for all the stars
in the {\sl ROSAT-PSPC} error circle of 15 arcsec. We give the V magnitude,
the colour indexes V--R and R--I
and their 1$\sigma$ errors. The second column 
reports the angular distance in arcsec from the position of the supersoft
X-ray source, the last column reports the number in
the catalog by Magnier et al. (1992). The nova candidate is star no.2.}
\label{Table}
$$ 
 \begin{array}{l c c c c c c c c c c c c l}
\hline
 $no.$ &  $d$(\arcsec) & \alpha_{2000} & \delta_{2000} &  $V$   &\sigma&  $B-V or B$ & \sigma &  $V-R or R$ & \sigma & $R-I or I$ &
 \sigma &  $Mag.no.$  \\
\hline
 1 &  1.3 & $0 44 4.65$ & $ 41 18 20.7$ & 22.78 & 0.10 &  -   &  -   &  0.71 & 0.13 & 1.97& 0.10 &      \\
 2 &  1.6 &  $0 44 4.71$ & $41 18 21.7$ &  -    & -    & 18.20&  0.10&   -   & -    & -   & -    & 
265487 \\  
 3 &  3.7 & $0 44 5.00$ & $41 18 17.7$ &  -    & -    & -    & -   &  21.74 & 0.08 & 1.14& 0.08 &       \\
 4 &  3.7 & $0 44 5.09$ & $41 18 20.6$ & 22.57 & 0.07 & 0.11 & 0.13 &  1.02 & 0.09 & 1.19& 0.07 & 265443\\
 5 &  4.0 & $0 44 4.42$ & $41 18 19.0$ & 19.19 & 0.01 & 0.89 & 0.02 &  0.45 & 0.02 & 0.47& 0.01 & 265325\\
 6 &  4.3 & $0 44 4.59$ & $41 18 24.0$ & 22.74 & 0.11 & -0.35&  0.13 & 1.55 & 0.14 &  -   &  -   &      \\
 7 &  5.0 & $0 44 5.19$ & $41 18 21.5$ & 21.89 & 0.05 & 1.03 & 0.11 & 0.77 & 0.06 & 0.97 & 0.04 &  265443\\
 8 &  5.1 & $0 44 5.16$ & $41 18 17.9$ &  -    & -    & -    & -  &   21.62 & 0.08 &  1.26 & 0.08 &  265221\\
 9 &  5.6 & $0 44 5.16$ & $41 18 23.4$ & 22.07 & 0.06 & 1.02 & 0.11&  1.04 & 0.07  & 1.17 & 0.04 &  265565\\
10 &  5.7 & $0 44 5.22$ & $41 18 17.6$ & 21.90 & 0.07 & 0.47 & 0.17&  0.33 & 0.10  & 1.26 & 0.08 &  265221\\
11 &  5.9 & $0 44 4.45$ & $41 18 15.5$ & 22.83 & 0.15 &  -   &  -  &  0.31 & 0.19  & 1.06 & 0.14  &      \\
12 &  6.5 & $0 44 5.28$ & $41 18 17.5$ &  -    & -    & -    & -   & 21.50 & 0.08  & 0.55 & 0.08  &      \\
13 &  6.9 & $0 44 5.31$ & $41 18 17.3$ & 22.44 & 0.10 & 0.11 & 0.14&  0.93 & 0.11  & 0.55 & 0.08  &      \\
14 &  6.9 & $0 44 4.64$ & $41 18 13.5$ & -    & -    & -    & -   & 22.02 & 0.07  & 1.95 & 0.07  & 264909\\
15 &  7.2 & $0 44 5.35$ & $41 18 22.8$ & 22.45 & 0.12 & 0.61 & 0.17 & 0.61 & 0.14  & 0.76 & 0.09  &      \\
16 &  7.4 & $0 44 5.40$ & $41 18 18.5$ & 22.52 & 0.06 & 0.18 & 0.12 & 0.67 & 0.08  & 1.23 & 0.06  &      \\
17 &  7.4 & $0 44 4.35$ & $41 18 14.4$ & 22.58 & 0.06 &  -   &  -   & 0.47 & 0.09  & -    & -     &     \\
18 &  7.6 & $0 44 5.05$ & $41 18 27.0$ & 22.87 & 0.13 & 0.10 & 0.16 & 0.48 & 0.17  & 0.38 &0.20   &     \\
19 &  7.6 & $0 44 4.78$ & $41 18 12.6$ & 23.09 & 0.11 &  -   &  -   & 1.55 & 0.13  & 0.62 & 0.08  &      \\
20 &  7.6 & $0 44 4.68$ & $41 18 12.6$ & 23.04 & 0.18 & -0.37&  0.20&  1.09 & 0.19 & 1.02 & 0.08  &      \\
21 &  8.2 & $0 44 5.46$ & $41 18 18.2$ &  -    & -    & -    & -   & 21.91 & 0.06  & 1.24 & 0.07  &      \\
22 &  8.6 & $0 44 4.94$ & $41 18 28.5$ &  -    & -    & -    & -   & 21.74 & 0.06  & 0.96 & 0.08  &      \\
23 &  8.7 & $0 44 4.65$ & $41 18 11.6$ & 22.97 & 0.14 & 0.42 & 0.19 & 1.16 & 0.15  & 0.52 & 0.10  &
 $k282 (HII reg.)$ \\ 
24 &  8.8 & $0 44 5.46$ & $41 18 16.3$ & 22.73 & 0.10 & 1.11 & 0.21 & 1.02 & 0.11  & 1.16 & 0.06  &      \\
25 &  9.4 & $0 44 5.58$ & $41 18 18.0$ & 22.84 & 0.09 & 0.30 & 0.13 & 1.09 & 0.11  & 1.26 & 0.06  &      \\
26 &  9.5 & $0 44 5.48$ & $41 18 15.2$ &  -    & -    & -    & -   & 21.72 & 0.06  & 1.17 & 0.06  & 265076\\
27 &  9.8 & $0 44 5.07$ & $41 18 29.4$ & 22.13 & 0.10 &  -   &  -  &  0.59 & 0.11  & 1.10 & 0.04  &      \\
28 &  9.9 & $0 44 5.48$ & $41 18 14.5$ & 22.85 & 0.08 &  -   &  -  &  0.83 & 0.11  & 1.59 & 0.09  &      \\
29 &  9.9 & $0 44 4.29$ & $41 18 11.8$ & 22.22 & 0.06 & 0.74 & 0.09&  0.45 & 0.08  & 0.86 & 0.08  &      \\
30 &  9.9 & $0 44 5.51$ & $41 18 25.3$ & 23.15 & 0.35 &  -   &  -  &  2.31 & 0.35  & 0.68 & 0.04  & 265711\\
31 & 10.0 & $0 44 5.62$ & $41 18 22.6$ &  -    & -    & -    & -   & 22.89 & 0.15  & 1.96 & 0.15  &      \\
32 & 10.0 & $0 44 5.60$ & $41 18 17.0$ &  -    & -    & -    & -   & 21.77 & 0.07  & 1.27 & 0.07  &      \\
33 & 10.6 & $0 44 5.50$ & $41 18 13.5$ &  -    & -    & -    & -   & 22.10 & 0.08  & 1.60 & 0.09  &      \\
34 & 10.6 & $0 44 5.31$ & $41 18 28.7$ &  -    & -    & -    & -   & 22.18 & 0.09  & 1.30 & 0.09  &      \\
35 & 10.6 & $0 44 3.96$ & $41 18 25.7$ & 21.93 & 0.07 & 0.99 & 0.11 & 0.71 & 0.08  & 1.00 & 0.06  & 265764\\
36 & 10.6 & $0 44 5.65$ & $41 18 16.6$ & 22.73 & 0.10 &  -   &  -   & 1.03 & 0.12  & 2.36 & 0.07  & 265131\\
37 & 10.6 & $0 44 5.41$ & $41 18 12.5$ & 23.15 & 0.13 & -0.48&  0.15 & 0.86 & 0.17 & 0.48 & 0.16  &      \\
38 & 10.7 & $0 44 3.87$ & $41 18 16.2$ & 22.93 & 0.08 &  -   &  -   & -0.18 & 0.15 &  -   & -     &     \\
39 &  10.8 & $0 44 4.80$ & $41 18 31.0$ & 23.69 & 0.19 &  -   &  -   & 1.02 & 0.23  & -    & -     &     \\
40 & 10.9 & $0 44 4.12$ & $41 18 28.3$ &  -    & -    & -    & -   & 21.08 & 0.04  & 1.11 & 0.04  & 265895\\
41 & 11.1 & $0 44 5.22$ & $41 18 10.4$ &  -    & -    & -    & -   & 22.07 & 0.07  & 1.43 & 0.08  &      \\
42 & 11.1 & $0 44 5.62$ & $41 18 14.8$ &  -    & -    & -    & -   & 21.75 & 0.05  & 1.55 & 0.06  &      \\
43 & 11.3 & $0 44 4.92$ & $41 18 31.4$ & 22.32 & 0.08 & 0.87 & 0.13 &  0.70 & 0.09 & 1.13 & 0.06  &      \\
44 & 11.5 & $0 44 5.72$ & $41 18 16.3$ &  -    & -    & -    & -   & 21.82 & 0.07  & 2.38 & 0.07  & 265131\\
45 & 11.5 & $0 44 5.24$ & $41 18 10.1$ & 22.89 & 0.09 &  -   &  -  &  0.87 & 0.11  & 1.42 & 0.07  &      \\
46 & 11.5 & $0 44 4.46$ & $41 18 31.1$ & 21.84 & 0.05 & 0.69 & 0.08 & 0.81 & 0.07  & 1.39 & 0.05  & 266128\\
47 & 11.5 & $0 44 3.76$ & $41 18 22.3$ & 22.68 & 0.08 &  -   &  -   & 0.79 & 0.10  & 1.47 & 0.08  & 265573\\
48 & 11.7 & $0 44 5.66$ & $41 18 14.5$ & 23.04 & 0.10 & 0.62 & 0.20 & 1.32 & 0.11  & 1.54 & 0.05  &      \\
49 & 11.8 & $0 44 4.50$ & $41 18  8.8$ & 21.66 & 0.03 & 1.52 & 0.09 & 1.19 & 0.04  & 1.15 & 0.03  & 264615\\
50 & 11.9 & $0 44 3.98$ & $41 18 28.2$ & 22.65 & 0.14 & -0.26&  0.11 &   -  &  -   & 19.99 & 0.01 &       \\
51 & 12.1 & $0 44 5.50$ & $41 18 11.4$ & 22.43 & 0.06 & 0.61 & 0.12  & 0.54 & 0.10 & 1.01 & 0.09  &      \\
52 & 12.1 & $0 44 4.05$ & $41 18 11.1$ & 22.64 & 0.07 & 0.36 & 0.11  & 0.68 & 0.10 & 1.18 & 0.09  &      \\
53 & 12.2 & $0 44 5.67$ & $41 18 26.7$ & 20.58 & 0.03 & 0.18 & 0.03  & 0.15 & 0.03 & 0.43 & 0.04  & 265816\\
54 & 12.2 & $0 44 4.68$ & $41 18  8.1$ & 22.43 & 0.06 & 0.90 & 0.13  & 0.80 & 0.08 & 1.15 & 0.06  &      \\
55 & 12.3 & $0 44 5.34$ & $41 18 30.7$ & 22.90 & 0.15 &  -   &  -    & 0.76 & 0.16 &  -   & -     &     \\
56 & 12.3 & $0 44 4.44$ & $41 18 32.0$ &  -    & -    & -    & -   & 21.09 & 0.05  & 1.40 & 0.05  & 266128\\
57 & 12.4 & $0 44 5.86$ & $41 18 19.6$ & 22.39 & 0.08 & 1.03 & 0.15 & 0.84 & 0.10  & 0.14 & 0.11  & 265353\\
58 & 12.4 & $0 44 4.70$ & $41 18 32.6$ & 22.96 & 0.17 & 0.84 & 0.30 &  -   & -     & -    & -     &     \\
            \hline
         \end{array}
$$
\end{table*}
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\setcounter{table}{2}
\begin{table*} %second page of Table 3
\caption{continued}
$$
\begin{array}{l c c c c c c c c c c c c l}
\hline
$no.$ &  $d$(\arcsec) & \alpha_{2000} & \delta_{2000} &  $V$   & \sigma&  $B-V or B$ & \sigma &  $V-R  or R$ & \sigma & $R-I or  I$&
 \sigma &  $Mag.no.$  \\
\hline
59 & 12.6 & $0 44 3.66$ & $41 18 18.1$ &  -    & -    & -    & -   & 21.13 & 0.05 & -0.58 & 0.15  & 265294\\
60 & 12.7 & $0 44 5.14$ & $41 18 32.2$ & 22.68 & 0.10 & 1.19 & 0.20 & 0.39 & 0.13 & 1.12 & 0.11   &     \\
61 & 12.8 & $0 44 5.89$ & $41 18 19.9$ &  -    & -    & -    & -   & 21.52 & 0.11 & 0.14 & 0.11  & 265353\\
62 & 12.9 & $0 44 5.89$ & $41 18 22.2$ &  -    & -    & -    & -   & 21.89 & 0.06 & 1.21 & 0.07  & 265485\\
63 & 12.9 & $0 44 3.95$ & $41 18 11.2$ & 22.43 & 0.07 & 0.19 & 0.14 & 0.80 & 0.09 & 1.13 & 0.07  & 264754\\
64 & 13.0 & $0 44 5.68$ & $41 18 28.0$ & 22.72 & 0.10 & 0.48 & 0.15 & 0.29 & 0.16 & 1.23 & 0.17   &     \\
65 & 13.0 & $0 44 5.62$ & $41 18 11.5$ & 23.34 & 0.14 & 0.05 & 0.20 & 1.08 & 0.18 & 1.48 & 0.12   &     \\
66 & 13.7 & $0 44 5.89$ & $41 18 25.1$ & 22.73 & 0.13 & 0.60 & 0.18 & 0.86 & 0.14 & 1.40 & 0.06  & 265728\\
67 & 13.7 & $0 44 3.99$ & $41 18  9.5$ & 22.19 & 0.07 &  -   &  -   & 0.47 & 0.11 & 0.60 & 0.13  &      \\
68 & 13.8 & $0 44 5.90$ & $41 18 25.2$ &  -    & -    & -    & -   & 21.90 & 0.05 & 1.40 & 0.06  & 265728\\
69 & 13.9 & $0 44 5.60$ & $41 18 30.4$ & 22.67 & 0.11 & 1.46 & 0.25 & 0.46 & 0.14 & 1.43 & 0.11  &    \\  
70 & 14.0 & $0 44 5.99$ & $41 18 21.8$ & 22.53 & 0.08 &  -   &  -   & 0.50 & 0.12 & 1.12 & 0.10  &    \\  
71 & 14.1 & $0 44 3.95$ & $41 18  9.4$ &  -    & -    & -    & -   & 21.74 & 0.09 & 0.61 & 0.13  &    \\  
72 & 14.1 & $0 44 3.90$ & $41 18  9.9$ & 22.45 & 0.09 &  -   &  -  &  0.49 & 0.13 &  -   & -     &    \\ 
73 & 14.2 & $0 44 5.77$ & $41 18 11.7$ &  -    & -    & -    & -   & 22.10 & 0.10 & 0.99 & 0.10  &    \\  
74 & 14.3 & $0 44 4.54$ & $41 18  6.1$ & 22.24 & 0.08 & 0.20 & 0.10 & 1.00 & 0.09 & 1.30 & 0.06  &    \\  
75 & 14.4 & $0 44 3.49$ & $41 18 21.6$ & 22.03 & 0.08 &  -   &  -  &  0.98 & 0.09 & 1.16 & 0.03  &    \\  
76 & 14.5 & $0 44 6.04$ & $41 18 18.8$ & 22.37 & 0.06 & 1.10 & 0.22&  0.89 &0.08  & 0.76 & 0.07  &     \\ 
77 & 14.5 & $0 44 5.90$ & $41 18 26.8$ & 22.44 & 0.11 &  -   &  -  &  0.95 & 0.12 & 0.96 & 0.06  &    \\  
78 & 14.6 & $0 44 3.62$ & $41 18 13.4$ & 22.97 & 0.10 & 0.47 & 0.16&  1.55 &0.11 & 1.39 & 0.05   &     \\
79 & 14.6 & $0 44 6.05$ & $41 18 21.8$ & 22.67 & 0.11 &  -  &   -  &  0.64 & 0.13 & 1.12 & 0.12  &    \\  
80 & 14.6 & $0 44 5.34$ & $41 18 33.2$ & 21.78 & 0.04 & 1.18 & 0.08&  0.76 & 0.05 & 0.91 & 0.04  & 266223 \\
81 & 14.7 & $0 44 5.99$ & $41 18 15.3$ & 22.61 & 0.07 & 0.44&  0.11&  0.76 & 0.09 & 1.59 & 0.07  &      \\
82 & 14.7 & $0 44 3.50$ & $41 18 24.4$ & 21.75 & 0.05 &  - &    -  &  0.55 & 0.07 &  -   & -    & 265643 \\
83 & 14.8 & $0 44 3.59$ & $41 18 13.5$ &  -    & -    & -  &   -   & 21.86 & 0.07 & 0.77 & 0.09 &      \\ 
84 & 14.8 & $0 44 6.06$ & $41 18 18.2$ &  -    & -    & -  &   -   & 21.47 & 0.05 & 0.76 & 0.07 &       \\
85 & 14.8 & $0 44 4.46$ & $41 18  5.8$ & 21.73 & 0.06 &  - &    -  &  1.04 & 0.07 & 0.07 & 0.06  & 264388 \\
86 & 14.9 & $0 44 5.22$ & $41 18  6.3$ &  -    &  -   &  - &    -  & 21.70 & 0.07 & 1.19 & 0.07  & \\     
\hline
                 \end{array}
$$
        \end{table*}
%
\end{document}
