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\IBVShead{4376}{24 September 1996}

\centerline{\ft PHOTOELECTRIC $BVR_c$ OBSERVATIONS OF THE PECULIAR}
\centerline{\ft CEPHEID V473 Lyr}
\vskip 8mm
\begintext

V473 Lyr is classified  as a Cepheid with variable amplitude in the GCVS.
So for the study of the pulsation behaviour of this star, it is very
important to observe it as often as possible.

We observed V473 Lyr at Mt. Maidanak observatory in August 1996.
The 60--cm reflector was used and 79 $BVR_c$
measurements were obtained (Table 1); the accuracy
of the individual data is near 0.01 mag in all filters.
According to our data, the amplitude of the light
curve (Fig.1) is near 0.09 mag in V.

The phases are calculated with the elements:

    $$Max JD hel = 2428738.767 + 1.490813 \times E.$$

The research described in this publication was made possible in part
by grants
No. 95--02--05276 and No. 94--02--04347 from the Russian
Foundation of Basic Research.

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\centerline{Figure 1}
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Table 1
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\normalsize
\begin{tabular}{cccccccccc}
\hline
JD hel&$Phase$&$V$&$B-V$&${V-R}_c$&JD hel&$Phase$&$V$&$B-V$&${V-R}_c$\\
2450000+ & & & & &2450000+ & & & & \\
\hline
305.1712& .203&  6.131&  .579&  .357& 312.3209& .999&  6.096&  .570&  .346\\
305.2111& .230&  6.139&  .590&  .357& 312.3615& .026&  6.095&  .578&  .334\\
305.2474& .254&  6.144&  .597&  .351& 312.4033& .054&  6.106&  .576&  .342\\
305.2991& .289&  6.146&  .599&  .353& 312.4469& .083&  6.113&  .588&  .334\\
305.3440& .319&  6.159&  .602&  .354& 313.1559& .559&  6.186&  .594&  .351\\
305.3870& .348&  6.152&  .622&  .346& 313.1736& .571&  6.179&  .608&  .357\\
305.4144& .366&  6.154&  .609&  .349& 313.2046& .592&  6.175&  .607&  .353\\
305.4317& .378&  6.167&  .611&  .355& 313.2528& .624&  6.170&  .601&  .358\\
306.1627& .868&  6.115&  .564&  .343& 313.2997& .655&  6.167&  .596&  .353\\
306.1882& .885&  6.110&  .567&  .340& 313.3381& .681&  6.162&  .596&  .356\\
306.2582& .932&  6.114&  .561&  .346& 314.1405& .219&  6.143&  .579&  .356\\
306.2919& .955&  6.092&  .577&  .341& 314.1606& .233&  6.136&  .594&  .351\\
306.3307& .981&  6.101&  .571&  .344& 314.1998& .259&  6.148&  .592&  .350\\
306.3638& .003&  6.094&  .563&  .348& 314.2432& .288&  6.156&  .596&  .354\\
306.3972& .025&  6.110&  .575&  .343& 314.2835& .315&  6.160&  .600&  .352\\
306.4479& .059&  6.098&  .573&    - & 314.3310& .347&  6.163&  .602&  .353\\
307.1971& .562&  6.189&  .589&  .362& 314.3537& .362&  6.168&  .605&  .356\\
307.2282& .583&  6.178&  .608&  .356& 314.4044& .396&  6.177&  .605&  .357\\
307.3268& .649&  6.165&  .600&  .353& 315.1417& .891&  6.124&  .559&  .348\\
307.3601& .671&  6.157&  .591&  .349& 315.2067& .935&  6.111&  .561&  .337\\
307.4042& .701&  6.151&  .596&  .351& 315.2449& .960&  6.111&  .564&  .341\\
310.2229& .592&  6.176&  .602&  .355& 315.3078& .002&  6.107&  .574&  .335\\
310.2514& .611&  6.172&  .598&  .358& 315.3460& .028&  6.109&  .569&  .338\\
310.2861& .634&  6.153&  .595&  .349& 315.4011& .065&  6.112&  .576&  .339\\
310.3180& .655&  6.155&  .597&  .353& 315.4522& .099&  6.118&    - &  .340\\
310.4237& .726&  6.146&  .597&  .341& 316.1413& .561&  6.193&  .598&  .365\\
311.1554& .217&  6.129&  .586&  .348& 316.1541& .570&  6.192&  .595&  .363\\
311.1973& .245&  6.139&  .593&  .349& 316.2294& .621&  6.182&  .598&  .354\\
311.2317& .268&  6.143&  .598&  .351& 316.2571& .639&  6.183&  .592&  .364\\
311.2614& .288&  6.154&  .592&  .363& 316.3024& .670&  6.181&  .598&  .361\\
311.2926& .309&  6.155&  .601&  .352& 316.3522& .703&  6.171&  .585&  .351\\
311.3192& .327&  6.160&  .600&  .352& 316.4041& .738&  6.144&  .574&  .348\\
311.3423& .342&  6.157&  .604&  .346& 316.4459& .766&  6.135&  .569&  .339\\
311.3640& .357&  6.163&  .603&  .358& 317.1557& .242&  6.157&  .586&  .355\\
311.4070& .386&  6.164&  .613&  .354& 317.2010& .272&  6.164&  .591&  .356\\
312.1500& .884&  6.118&  .568&  .347& 317.2501& .305&  6.166&  .598&  .348\\
312.1682& .896&  6.114&  .572&  .339& 317.2983& .338&  6.175&  .596&  .357\\
312.2015& .919&  6.111&  .572&  .345& 317.3489& .371&  6.181&  .598&  .358\\
312.2335& .940&  6.111&  .572&  .344& 317.4158& .416&  6.187&  .592&  .352\\
312.2721& .966&  6.110&  .572&  .341\\    
\hline
\end{tabular}
\end{center}
\large
\vskip .7cm
\beginauthors
 L.N. BERDNIKOV
 O.V. VOZYAKOVA
 Sternberg Astronomical 
 Institute
 13 Universitetskij prosp.
 Moscow 119899, Russia
\authorsrightcol
 V.V. IGNATOVA
 Astronomical Institute
 33 Astronomicheskaya ul.
 Tashkent 520000, Uzbekistan
\vskip 11mm
\endauthors


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