\documentstyle[twoside, epsf]{article}

\input ibvs2.sty

\begin{document}

\IBVShead{5406}{5 May 2003}

\IBVStitle{Three New PMS Variables in the Vicinity of NGC 7129}

\IBVSauth{SEMKOV, E. H.}

\IBVSinsto{Institute of Astronomy, Bulgarian Academy of Sciences, 72, Tsarigradsko Shose blvd., BG-1784 Sofia, Bulgaria; e-mail: evgeni@skyarchive.org}

\SIMBADobj{V391 Cep}
\IBVSobj{V1}
\IBVSobj{V2}
\IBVSobj{V3}
\IBVStyp{ TTau }
\IBVSkey{photometry}
\IBVSabs{Tree new PMS variable stars were found in the vicinity of NGC 7129.}
\IBVSabs{They are located in the dark clouds northwest of the emission nebula.}
\IBVSabs{BVRI photometric observations of the newly discovered variables were}
\IBVSabs{presented in the paper.}


\begintext

The previous observations suggest that NGC 7129 is a region of active star formation
(Magakian and Movsesian, 1997).
The small emission nebula and the dark clouds around are a part from the giant
molecular cloud complex in Cepheus.
T Tauri and Herbig's Ae/Be stars, Herbig-Haro objects, collimated jets and cometary
nebulae are observed in the region of NGC 7129.
One of the best-studied objects in this region is the Pre-Main Sequence star (PMS) V391 Cep (Semkov, 2003).
The star lie in the dark clouds 40\arcm\ northwest from the center of NGC 7129.
In this paper we present photometric data for tree new PMS variables in the close
proximity of V391 Cep.

Our CCD photometric observations were made with three telescopes: the 2-m RCC and
the 50/70/172 cm Schmidt telescopes of the National Astronomical Observatory Rozhen
(Bulgaria) and the 1.3-m RC telescope of the Skinakas Observatory\footnote{Skinakas
Observatory is a collaborative project of the University of Crete, the Foundation for
Research and Technology - Hellas, and the Max-Planck-Institut f\"{u}r Extraterrestrische
Physik.} of the Institute of Astronomy, University of Crete (Greece).
The observations ware taken with the purpose to study variability of V391 Cep and
all information concerning used CCD cameras, filters, exposures, standards and
aperture photometry is summarized in Semkov (2003).

\IBVSfig{5cm}{5406-f1.eps}{Finding chart of the new variable stars\vspace*{-1cm}}
%%\IBVSfigKey{5406-f1.eps}{NGC 7129}{finding chart}

The finding chart of the new variable stars is presented in Fig. 1.
New variables are labeled V1, V2 and V3 in order of their R. A.
The position of V391 Cep is also marked on the figure.
The field is $10\arcm\times10\arcm$, north is at the top and east to the left.
The chart is retrieved from the STScI Digitized Sky Survey Second Generation Red.
The positions of the tree new variables (J2000.0) in the Aladin Sky Atlas are:

\begin{center}
{\small 
V1 R.A.~=~21\hr40\mm11\fsec75 and Dec~=~66\deg30\arcm21\farcs4\\
V2 R.A.~=~21\hr40\mm22\fsec88 and Dec~=~66\deg36\arcm31\farcs6\\
V3 R.A.~=~21\hr40\mm38\fsec79 and Dec~=~66\deg35\arcm02\farcs7\\
}
\end{center}

The results from our CCD photometric observations of V1, V2 and V3 are
given in Tables 1, 2 and 3 respectively.
The tables contains Date, Julian Date, $V$ magnitude, $B-V$, $V-R_C$ and $V-I_C$ indices
and telescope used.
The $V$-light curves of the new variables are presented in Fig. 2, Fig. 3 and Fig. 4.
V2 and V3 were discovered as variables during our campaign to calibrate a standard
comparison sequence in the field of V391 Cep.
The both objects exhibit extended emission a characteristic typical of PMS stars.
The new variable V1 was discovered and as an H$\alpha$ emission source
in our objective prism survey (Semkov and Tsvetkov, 1986).

Our observations reviled that the V1, V2 and V3 show irregular variability with amplitudes
of 0\fmm7, 1\fmm1 and 1\fmm2 ($V$-light) respectively.
Having in mind the observed irregular variability, extended emission around V2 and V3 and
observed H$\alpha$ emission for V1 it is possible to suspect that the tree new variables
belong to the class of PMS stars.

\IBVSfig{4cm}{5406-f2.eps}{$V$-light curve of V1 during the period of observations\vspace*{-1.5cm}}
%%\IBVSfigKey{5406-f2.eps}{V1}{light curve}

\IBVSfig{4cm}{5406-f3.eps}{$V$-light curve of V2 during the period of observations\vspace*{-1.5cm}}
%%\IBVSfigKey{5406-f3.eps}{V2}{light curve}

\IBVSfig{4cm}{5406-f4.eps}{$V$-light curve of V3 during the period of observations\vspace*{-1.5cm}}
%%\IBVSfigKey{5406-f4.eps}{V3}{light curve}

\clearpage

\begin{table}[!ht]
  \caption{Photometric observations of V1 in the period
  October 2000 - November 2002}
  \vskip 2mm
\small
  \begin{center}
  \begin{tabular}{ccccccc}
     \hline
     \noalign{\smallskip}
Date & J.D. (24\dots)  & $V$    &   $B-V$ & $V-R_C$ & $V-I_C$ & Tel. \\
     \noalign{\smallskip}
     \hline
     \noalign{\smallskip}
29.10.2000  & 51847.379 & 16.28 & 1.32 & 0.83 & 1.88 & Scm\\
30.10.2000  & 51848.419 & 16.04 & 1.36 & 0.81 & 1.75 & Scm\\
24.12.2000  & 51903.287 & 16.16 & 1.13 & 0.89 & 1.88 & Scm\\
27.05.2001  & 52057.492 & 16.40 & $-$  & $-$  & 1.58 & Scm\\
~~5.02.2002 & 52311.261 & 15.99 & 1.14 & 0.83 & 1.92 & Scm\\
~~6.02.2002 & 52312.259 & 16.29 & $-$  & 0.80 & 1.83 & Scm\\
~~7.02.2002 & 52313.247 & 16.65 & 1.84 & 0.99 & 2.08 & Scm\\
~~8.06.2002 & 52433.536 & 16.03 & 1.26 & 0.82 & 1.76 & 1.3m\\
~~3.10.2002 & 52551.459 & 16.05 & $-$  & 0.79 & 1.64 & Scm\\
~~4.10.2002 & 52552.487 & 15.99 & $-$  & 0.77 & 1.71 & Scm\\
29.10.2002  & 52577.375 & 16.08 & 1.20 & 0.81 & 1.82 & Scm\\
30.10.2002  & 52578.371 & 16.19 & 1.34 & 0.87 & 1.90 & Scm\\
31.10.2002  & 52579.275 & 16.09 & 1.12 & 0.83 & 1.75 & Scm\\
~~1.11.2002 & 52580.258 & 15.94 & 1.21 & 0.78 & 1.73 & Scm\\
26.11.2002  & 52605.233 & 15.96 & $-$  & $-$  & 1.76 & Scm\\
28.11.2002  & 52607.258 & 16.30 & 1.29 & 0.87 & 1.94 & Scm\\
29.11.2002  & 52608.246 & 16.20 & 1.28 & 0.87 & 1.91 & Scm\\
        \noalign{\smallskip}
        \hline
   \end{tabular}
   \end{center}
   \end{table}

\begin{table}[!hb]
  \caption{Photometric observations of V2 in the period
  June 2000 - March 2003}
\small
  \vskip 2mm
  \begin{center}
  \begin{tabular}{ccccccc}
     \hline
     \noalign{\smallskip}
Date & J.D. (24\dots)  & $V$    &  $B-V$ & $V-R_C$ & $V-I_C$ & Tel. \\
     \noalign{\smallskip}
     \hline
     \noalign{\smallskip}
22.06.2000  & 51718.449 & 18.14 & $-$  & 1.07 & 2.24 &   1.3m\\
23.06.2000  & 51719.448 & 17.69 & 1.32 & 1.04 & 2.18 &   1.3m\\
24.06.2000  & 51720.384 & 17.67 & 1.34 & $-$  & 2.18 &   1.3m\\
11.07.2000  & 51736.507 & 18.21 & 1.28 & 1.02 & 2.21 &   1.3m\\
30.10.2000  & 51848.419 & 18.61 & $-$  & 1.28 & 2.37 &   Scm \\
24.12.2000  & 51903.287 & 17.97 & $-$  & 0.89 & 2.14 &   Scm \\
~~5.07.2001 & 52095.559 & 18.01 & 1.12 & 1.08 & 2.16 &   1.3m\\
~~6.07.2001 & 52097.298 & 17.99 & $-$  & $-$  & 2.21 &   1.3m\\
~~8.07.2001 & 52099.293 & 17.91 & $-$  & $-$  & 2.10 &   1.3m\\
16.07.2001  & 52106.536 & 18.02 & 1.34 & $-$  & 2.22 &   1.3m\\
~~7.08.2001 & 52128.528 & 17.80 & 1.33 & $-$  & 2.15 &   1.3m\\
~~1.09.2001 & 52153.592 & 18.15 & 1.54 & $-$  & 2.41 &   1.3m\\
~~2.09.2001 & 52154.575 & 17.74 & 1.06 & $-$  & 2.19 &   1.3m\\
~~5.09.2001 & 52157.546 & 18.42 & $-$  & $-$  & 2.39 &   1.3m\\
~~5.02.2002 & 52311.261 & 17.72 & $-$  & 1.20 & 2.34 &   Scm \\
~~6.02.2002 & 52312.259 & 17.53 & $-$  & 0.87 & 2.00 &   Scm \\
~~7.02.2002 & 52313.247 & 17.68 & $-$  & 0.75 & 1.88 &   Scm \\
~~8.06.2002 & 52433.536 & 18.31 & 1.38 & 1.13 & 2.29 &   1.3m\\
24.06.2002  & 52449.532 & 17.99 & $-$  & $-$  & 2.05 &   1.3m\\
16.07.2002  & 52471.540 & 18.32 & $-$  & $-$  & 2.36 &   1.3m\\
23.08.2002  & 52510.564 & 17.83 & 1.53 & 1.13 & 2.23 &   1.3m\\
29.10.2002  & 52577.375 & 17.75 & $-$  & 0.78 & 2.07 &   Scm \\
30.10.2002  & 52578.371 & 17.88 & $-$  & 0.96 & 2.14 &   Scm \\
31.10.2002  & 52579.275 & 18.19 & $-$  & 1.23 & 2.43 &   Scm \\
~~1.11.2002 & 52580.258 & 17.86 & $-$  & 1.01 & 2.26 &   Scm \\
28.11.2002  & 52607.258 & 17.76 & $-$  & 1.07 & 2.32 &   Scm \\
29.11.2002  & 52608.246 & 17.72 & $-$  & 1.12 & 2.31 &   Scm \\
27.02.2003  & 52697.599 & 17.73 & 1.37 & 1.10 & 2.13 &   2m  \\
28.02.2003  & 52698.559 & 17.63 & 1.38 & 1.09 & 2.15 &   2m  \\
~~2.03.2003 & 52700.547 & 17.57 & 1.29 & 1.11 & 2.20 &   2m  \\
~~3.03.2003 & 52701.509 & 17.64 & $-$  & 1.12 & 2.14 &   2m  \\
\noalign{\smallskip}
        \hline
   \end{tabular}
   \end{center}
   \end{table}

\clearpage

\begin{table}[!hb]
\vspace*{-1cm}
  \caption{Photometric observations of V3 in the period
  June 2000 - March 2003}
\small
  \vskip 2mm
  \begin{center}
  \begin{tabular}{ccccccc}
     \hline
     \noalign{\smallskip}
Date & J.D. (24\dots)  & $V$    &  $B-V$ & $V-R_C$ & $V-I_C$ & Tel. \\
     \noalign{\smallskip}
     \hline
     \noalign{\smallskip}
13.06.2000  & 51709.485 & 18.10 &  $-$ & 1.27 & 2.63 &  1.3m \\
14.06.2000  & 51710.497 & 17.52 &  $-$ & 1.16 & 2.44 &  1.3m \\
15.06.2000  & 51711.493 & 17.43 &  $-$ & 1.14 & 2.44 &  1.3m \\
16.06.2000  & 51712.490 & 18.01 & 1.21 &  $-$ & 2.49 &  1.3m \\
21.06.2000  & 51716.512 & 17.77 & 1.71 & 1.18 & 2.49 &  1.3m \\
21.06.2000  & 51717.392 & 17.21 &  $-$ &  $-$ & 2.36 &  1.3m \\
22.06.2000  & 51718.449 & 17.41 & 1.63 & 1.12 & 2.40 &  1.3m \\
23.06.2000  & 51719.448 & 18.15 & 1.67 & 1.19 & 2.50 &  1.3m \\
24.06.2000  & 51720.384 & 17.38 & 1.92 &  $-$ & 2.40 &  1.3m \\
11.07.2000  & 51736.507 & 17.72 & 1.80 & 1.17 & 2.53 &  1.3m \\
29.10.2000  & 51847.379 & 17.25 &  $-$ & 1.18 & 2.51 &   Scm \\
30.10.2000  & 51848.419 & 17.26 & 1.29 & 1.26 & 2.61 &   Scm \\
24.12.2000  & 51903.287 & 17.16 &  $-$ & 1.09 & 2.42 &   Scm \\
~~5.07.2001 & 52095.559 & 17.48 &  $-$ & 1.07 & 2.34 &  1.3m \\
~~6.07.2001 & 52097.298 & 17.52 &  $-$ &  $-$ & 2.37 &  1.3m \\
~~8.07.2001 & 52099.293 & 17.61 & 1.54 &  $-$ & 2.32 &  1.3m \\
16.07.2001  & 52106.536 & 17.69 & 1.71 &  $-$ & 2.42 &  1.3m \\
~~7.08.2001 & 52128.528 & 17.39 & 1.74 &  $-$ & 2.38 &  1.3m \\
~~1.09.2001 & 52153.592 & 18.20 & 1.13 &  $-$ & 2.78 &  1.3m \\
~~2.09.2001 & 52154.575 & 17.65 & 1.24 &  $-$ & 2.56 &  1.3m \\
~~5.09.2001 & 52157.546 & 17.79 &  $-$ &  $-$ & 2.67 &  1.3m \\
~~5.02.2002 & 52311.261 & 17.61 &  $-$ & 1.16 & 2.58 &   Scm \\
~~6.02.2002 & 52312.259 & 17.31 &  $-$ & 1.26 & 2.57 &   Scm \\
~~7.02.2002 & 52313.247 & 17.30 &  $-$ & 1.14 & 2.59 &   Scm \\
~~8.06.2002 & 52433.536 & 17.38 & 1.74 & 1.19 & 2.49 &  1.3m \\
24.06.2002  & 52449.532 & 17.64 &  $-$ &  $-$ & 2.62 &  1.3m \\
16.07.2002  & 52471.540 & 18.36 &  $-$ &  $-$ & 2.66 &  1.3m \\
23.08.2002  & 52510.564 & 17.51 & 1.41 & 1.24 & 2.54 &  1.3m \\
29.10.2002  & 52577.375 & 17.30 &  $-$ & 1.15 & 2.59 &   Scm \\
30.10.2002  & 52578.371 & 17.68 &  $-$ & 1.08 & 2.46 &   Scm \\
31.10.2002  & 52579.275 & 17.90 &  $-$ & 1.21 & 2.42 &   Scm \\
~~1.11.2002 & 52580.258 & 17.41 &  $-$ & 1.12 & 2.57 &   Scm \\
28.11.2002  & 52607.258 & 17.27 &  $-$ & 1.13 & 2.50 &   Scm \\
29.11.2002  & 52608.246 & 17.81 &  $-$ & 1.17 & 2.62 &   Scm \\
27.02.2003  & 52697.599 & 17.30 & 1.49 & 1.19 & 2.33 &   2m \\
28.02.2003  & 52698.559 & 18.28 & 1.44 & 1.32 & 2.48 &   2m \\
~~2.03.2003 & 52700.547 & 17.30 & 1.43 & 1.16 & 2.30 &   2m \\
~~3.03.2003 & 52701.509 & 17.68 &  $-$ & 1.24 & 2.47 &   2m \\
        \noalign{\smallskip}
        \hline
   \end{tabular}
   \end{center}
   \end{table}


\references

Magakian, T. Yu., Movsesian, T. A., 1997, {\it ARep}, {\bf 41}, 483
%%\BIBCODE{1997ARep...41..483M}

Semkov, E. H., Tsvetkov, M. K., 1986, {\it Star Clusters and Associations},
        Publ. of the Ast. Dep. E\"otv\"os Univ., Budapest, {\bf 8}, 141 \BIBCODE{1986scag.conf..141S}

Semkov, E. H., 2003, {\it IBVS}, No. 5373
%%\BIBCODE{ 2003IBVS.5373....1S}


\endreferences

\end{document}
