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\IBVShead{4410}{18 December 1996}

\centerline{\ft NSV\,03438, A NEW DETACHED ECLIPSING BINARY STAR}
\centerline{\ft IN CANIS MINOR}

\vskip 8mm

\begintext

Following the cooperation program between the Esteve Duran Observatory
Foundation and the Grup d'Estudis Astronomics, for the identification and
study of poorly observed variable stars, NSV\,03438 (= WR\,032 = CSV\,006558)
was monitored in the V band for 23 nights using a CCD camera, from 19
January to 5 May 1996. Observations were carried out with the 0.6-m
Cassegrain telescope at Esteve Duran Observatory in Seva (Spain) and the
0.4-m telescope at Mollet del Valles Observatory (Spain). GSC\,0762.2164
and GSC\,0762.2280 were used as comparison and check stars respectively.
NSV\,03438 could be unambiguously identified with GSC\,0762.2022.

In the NSV catalogue (Kholopov, 1982), it is recorded that variability of
NSV\,03438 was first observed by Weber (1957), who reported that this star
was a possible Cepheid with a photographic brightness variation from 10\fm 8
to 11\fm 7.

Our observations show that NSV\,03438 is not a Cepheid but a detached 
eclipsing binary star, with a period over 1.5 days. Phase curve indicates 
that primary and secondary minima are 0\fm 79 and 0\fm 74 deep partial occultations respectively (Figure 1). The following 
ephemeris has been derived:
\vskip 1mm
\centerline{Min. I = HJD\,2450122.48519 + 1\fd 535114 $\times$ E}
\hspace*{6.8cm}$\pm$0.00029\ \ $\pm$\ 0.000003

\epsfysize=8cm
\centerline{\epsffile{4410-f1.ps}}
\centerline{Figure 1}
\vfill \eject

\centerline{2}
\vskip 1mm

To determine the magnitude and B$-$V color index of NSV\,03438 and its
comparison star, these objects were also observed in the B and V bands
using an Optec SSP-5A photoelectric photometer. HR\,2647,  HR\,2710, and
HR\,2760 were used as comparison stars. As a result, it was obtained that
NSV\,03438 has a visual magnitude at maximum light of 10.81 $\pm$0.05  and
an observed color index of 0.49 $\pm$0.11.

Spectroscopic observations and multicolor photometry should be performed
in order to obtain more accurate information about this new eclipsing binary star.
\vskip 1cm

\beginauthors
E. GARCIA-MELENDO                
Esteve Duran Observatory         
El Montanya - Seva                
08553 SEVA                     
(Barcelona)                       
Spain                            
e-mail:duranobs@astro.gea.cesca.es
\authorsrightcol
J.M. GOMEZ-FORRELLAD
Grup d'Estudis Astronomics
Apartado 9481
08080 Barcelona
Spain
e-mail:jmgomez@astro.gea.cesca.es
\vskip 5mm
\endauthors

\references

Kholopov, P. N. editor, 1982, New Catalogue of Suspected Variable Stars,
 Moscow

Weber, R., 1957, Documentation des Observateurs, Circulaire,
 No.\,12

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