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\IBVShead{4352}{2 July 1996}

\title {HBV\,479: A NEW VARIABLE STAR IN HERCULES}

\begintext
An emission-line star near the PN Hu 2-1 (PK 51+9.1) in Hercules,
denoted as HBV\,479, was found to be a long period variable (Mira Ceti
type) during photographic observations of the ``Stellar ring No.\,373''.
The Schmidt camera (80/120, f=240 cm) of the Hamburg Observatory in
Bergedorf was used. The position of HBV 479 is:
$\alpha = 18^{\rm h}50^{\rm m}17$\fss 05,
\ \ $\delta = +20^\circ 50^\prime 39\farcs 4 (1950)$.

Altogether 14 direct Schmidt plates were taken in V (Kodak 103a-D
+GG11) between May 1971 and June 1975. Seven comparison stars are
shown together with the variable in Figure\,1; their V-magnitudes
(measured at least on 5 plates) are presented in Table~1;
the accuracy of
these magnitudes varies between $\pm$0.04 mag and $\pm$0.10 mag
with the exception of the star No.\,7.
Individual measurements of HBV\,479 are given in Table~2
with the accuracy of about $\pm$0.05 mag. The plates were measured
 with
the Haffner iris photometer (Haffner, 1953). The star varies between
12.1 and 16.6 mag. Assuming in the first approximation a sine-like
light curve we have derived period of 277.5 days and an
amplitude $\Delta$V = 4.8 mag (V between 11.8 and 16.6 mag).

The photoelectric sequence of Isserstedt and Schmidt-Kaler (1970) was
exposed on the plates with nearly the same distance from the centre as 
in the case of the variable.

\bigskip
\hspace*{0.9cm} Table 1. Comparison stars \hspace*{2.6cm}
Table 2. Brightness of HBV\,479
\medskip
\begin{center}
\begin{tabular}{llrccclcc}
%\multicolumn{3}{l}{Table 1: Brightness of comparison stars} & &
%\multicolumn{3}{l}{Table 2: Brightness of variable HBV 479}   \\
%           &          &     & &           &         &       \\
\cline{1-3} \cline{7-9}
%           &          &     & \hspace{1.cm} &   &   &       \\
Comparison &   ~~V    &   n & & & &Plate    &    JD    &     V   \\
star       &   [mag]  &     & & &&No.~(GS )& 2440000+ &   [mag] \\
%           &          &     & &         &          &         \\
\cline{1-3} \cline{7-9}
%        &          &        & &        &          &            \\
1      &     11\fm92&   5   &\ \ \  &\ \ \ & &4759    & 1073.6   &~~~14\fm33~~~ \\
2      &     12.08  &   5   & & & &4782    & 1180.4   &   13.64    \\
3      &     12.95  & ~~~~~~~~~~14 & & & &4816    & 1209.4   &   15.27 \\
4      &     13.62  &   5   & & & &4846    & 1240.3   &   15.87    \\
5      &     14.51  &  13   & & & &4997    & 1476.5   &   14.39    \\
6      &     14.73  &   5   & & & &5019    & 1511.5   &   16.1 :   \\
7      &     15.9   &   5   & & & &5091    & 1562.3   &   16.55    \\
\cline{1-3}
         &         &        & & & &5133    & 1592.3   &   15.81    \\
         &         &        & & & &5321    & 1831.5   &   16.3 :   \\
         &         &        & & & &5357    & 1922.4   &   14.27    \\
         &         &        & & & &5541    & 2269.4   &   12.54    \\
         &         &        & & & &5723    & 2493.7   &   12.12    \\
         &         &        & & & &5752    & 2545.6   &   12.39    \\
         &         &        & & & &5764    & 2568.5   &   13.72    \\
%        &          &        & &        &          &            \\
\cline{7-9}
\end{tabular}
\end{center}
\newpage

\centerline{2}
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\centerline{\epsffile{4352-f1.ps}}
\centerline{Figure 1. Identification chart of the variable
 and the comparison stars}

\bigskip

The spectral characteristics of the variable star are typical for
a long period variable of the spectral type Me: there are 6 Schmidt
spectral plates in the region 3600 - 6400~\AA  \ which show a medium strong
continuum and the emission lines H$\delta$, H$\gamma$  and probably
 H$\beta$, as well as TiO bands
4761, 4955, 5838 and 6148~\AA.

\vskip 2mm
{\it Acknowledgements:} I am grateful to {\it U. Haug} for his
 contribution to
the discovery of the variable, especially for having taken some plates
which belong to our observations concerning the stellar ring No.\,373.

\vskip 1cm

\beginauthors
\authorsrightcol
L. KOHOUTEK
Hamburger Sternwarte
Gojenbergsweg 112
D-21029 Hamburg
Germany
e-mail: lkohoutek@hs.uni-hamburg.de
\endauthors

\vskip 1.5cm

\references

Haffner, H., 1953, {\it Ver\"off. Univ. Sternw. G\"ottingen}, {\bf 106}

Isserstedt, J., Schmidt-Kaler, T., 1970, {\it A\&A}, {\bf 7}, 481

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