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\IBVShead{4429}{22 January 1997}

\centerline{\ft ACCURATE POSITIONS FOR 38 VARIABLES}
\centerline{\ft IN A 5\degr$\times$5\degr\ FIELD AROUND BL Lac}
\vskip 8mm

\begintext

Photographs of the field around BL Lac were taken with the AFR-1
wide-field astrograph (D=23 cm, F=230 cm, 5\fdg 5$\times$5\fdg 5
field) at Mt. Maidanak (Uzbekistan) in 1990--1992. The observations used the
method described by Shokin (1991) which allows to attenuate brightness of bright
reference stars. This reduces the influence of the brightness equation on
positions of faint objects and makes it possible to determine their coordinates
in a system very close to the fundamental one.

Positions of individual stars were derived from measurements of up to 15
plates. Table 1 contains equatorial coordinates, epochs of observations, and
GSC numbers (Lasker et al., 1990) for 38 variable stars in a
5\degr $\times$ 5\degr field.
The first column contains GCVS names or NSV catalog numbers. Asterisks mark
stars whose positions are most accurate (better than to 0\farcs 1); for the majority of
stars, the positions are accurate to 0\farcs 1-0\farcs 3. For four stars (V665 Cyg, V666 Cyg, V668 Cyg, V672 Cyg), the derived positions are least accurate
(to about 0\farcs 3) because we had to use three steps for reductions to the
source catalog. The Palomar prints show V668 Cyg as two components, partially
overlapping. The coordinates in Table 1 refer to the eastern, red component;
its variability is evident from two Palomar O-prints.

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\centerline{Figure 1}
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\centerline{2}
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\centerline{Table 1}
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\begin{center}
\begin{tabular}{llcccc}
\hline
\noalign{\medskip}
\multicolumn{2}{c}{Star}&$\alpha_{2000.0}$&$\delta_{2000.0}$&Epoch&GSC\\
\noalign{\medskip}
\hline
\noalign{\medskip}
UZ  & Cyg&21\fh59\fmm14\fss314&+44\degr 21\farcmm 34\farcs 58& 90.81& 3197.0221\\
GT  & Cyg&21 50 43.617& +42 54 11.52& 90.81& 3193.1551\\
MN  & Cyg&21 58 01.526& +44 26 38.57& 90.81& 3197.1716\\
MU  & Cyg&21 59 13.506& +44 42 00.43& 90.81& 3197.0616\\
V665& Cyg&21 49 15.956& +43 03 36.49& 53.70\\
V666& Cyg&21 49 25.862& +43 22 25.36& 53.70\\
V668& Cyg&21 49 56.837& +40 56 31.94& 53.70\\
V670& Cyg&21 50 19.432& +42 46 27.56& 90.81& 3193.0469\\
V672& Cyg&21 51 21.443& +44 39 50.12& 75.30\\
V673& Cyg*&21 51 37.755& +43 09 58.75& 92.69& 3197.2745 \\
V676& Cyg&21 52 59.131& +44 18 19.25& 90.81\\
V677& Cyg&21 53 17.670& +44 03 23.08& 90.81& 3197.0163\\
V683& Cyg&21 57 32.615& +44 10 19.71& 90.81\\
V1093&Cyg&21 53 29.263& +44 05 05.35& 90.81& 3197.0545\\
V1096&Cyg*&21 55 52.164& +41 35 46.72& 92.69\\
RS&Lac&22 12 52.535& +43 45 01.03& 90.81& 3211.1056\\
RY&Lac&22 12 15.555& +43 50 04.23& 90.81& 3211.0260\\
BI&Lac&22 00 49.035& +42 45 39.25& 90.81& 3206.0669\\
BK&Lac*&22 02 19.725& +43 34 44.38& 90.73& 3210.1226\\
BL&Lac*&22 02 43.287& +42 16 39.92& 90.73\\
BO&Lac&22 14 56.692& +42 20 44.46& 90.81& 3207.0267\\
DE&Lac*&22 10 07.774& +40 55 10.63& 90.73& 3203.0565\\
DL&Lac&21 58 37.128& +41 46 24.61& 90.81& 3193.0554\\
EL&Lac&22 08 53.723& +42 16 21.26& 90.81& 3206.1935\\
ET&Lac*&21 59 06.287& +41 03 55.98& 92.69& 3189.0410\\
FU&Lac&22 00 26.741& +43 51 19.66& 90.81\\
GN&Lac&22 06 51.500& +43 22 57.20& 90.81& 3210.1444\\
KQ&Lac*&22 15 51.763& +40 25 13.08& 92.69& 3203.0344\\
V351&Lac*&22 00 48.151& +42 30 43.24& 91.71& 3206.0663\\
V352&Lac&22 01 11.566& +43 07 32.31& 90.81& 3210.1466\\
\multicolumn{2}{l}{NSV 13904*}&21 51 43.222& +43 09 23.62& 92.69\\
\multicolumn{2}{l}{NSV 13917}&21 52 39.266& +43 39 08.39& 90.81& 3197.1927\\
\multicolumn{2}{l}{NSV 13922}&21 52 58.166& +44 00 55.25& 90.81\\
\multicolumn{2}{l}{NSV 13975}&21 57 26.500& +42 58 18.65& 90.81\\
\multicolumn{2}{l}{NSV 13976}&21 57 29.886& +44 41 48.46& 90.81\\
\multicolumn{2}{l}{NSV 13978}&21 57 30.936& +43 20 56.83& 90.81\\
\multicolumn{2}{l}{NSV 13989}&21 59 00.750& +44 43 50.27& 90.81& 3197.0828\\
\multicolumn{2}{l}{NSV 13990}&21 59 23.863& +43 53 21.62& 90.81& 3197.0357\\
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\hline
\end{tabular}
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\centerline{3}
\vskip 1mm
\centerline{Table 2}
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\begin{center}
\begin{tabular}{llcc}
\hline
\noalign{\medskip}
\multicolumn{2}{c}{Star}&PPM&HIC\\
\noalign{\medskip}
\hline
\noalign{\medskip}
\multicolumn{2}{l}{NSV 13907}&062147\\
\multicolumn{2}{l}{NSV 13974}&087224\\
 RT&Lac&062368&  108728\\
 BG&Lac&062336&  108630\\
 CM&Lac&062327\\
 CS&Lac&062318\\
 CX&Lac&062506\\
VZ&Cyg& 062131 &  107899\\
\noalign{\medskip}
\hline
\end{tabular}
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\vskip 3mm
Table 2 contains PPM catalog (R\"oser and Bastian, 1991) identifications for
eight bright variable stars in the program field; three of them are also
identified with the HIPPARCOS input catalog (1992). We present finding charts
(earlier never published) for GT Cyg and EL Lac; we have confirmed the
variability of the corresponding stars using plates taken with the Sternberg
Institute's 40 cm astrographs in Crimea. Each charts covers a $5'\times5'$
field.

We are grateful to Mr. S. Antipin and Dr. V. Goranskij for assistance. This
study was partially supported by the Russian Foundation for Basic Research
through grant No. 95-02-05189. The finding charts are based on the Digitized Sky
Survey, produced at the Space Telescope Science Institute under U.S.
Government grant NAG W-2166.

\vskip 1cm

\beginauthors
Yu.A. SHOKIN
Sternberg Astronomical Institute
13, Universitetskij Prosp.,
Moscow 119899, Russia
\authorsrightcol
N.N. SAMUS
Institute of Astronomy
48, Pyatnitskaya Str.
Moscow 109017, Russia
\endauthors


\references

HIPPARCOS Input Catalogue, 1992, European Space Agency, ESA SP-1136

Lasker, B.M., Sturch, C.R., McLean, B.J. et al., 1990, {\it Astron. J.},  {\bf 99}, 2019

R\"oser, S. and Bastian, U., 1991, PPM Star Catalogue, Heidelberg:
Astron. Rechen-Inst.

Shokin, Yu.A., 1991, Astron. Tsirk., No. 1547, 39


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