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\IBVShead{4407}{9 December 1996}

\centerline{\ft NSV\,08513, A NEW DETACHED}
\centerline{\ft ECLIPSING BINARY STAR IN OPHIUCHUS}
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\begintext

According to Kholopov (1982), the variability of NSV\,08513 (BD\,$-$00\degr3264, BV\,0167, CSV\,007634, GSC\,5066.0280) was announced by
Strohmeier et al. (1957), who indicated that this object underwent fast
light changes between photographic magnitudes 10\fm 7 and 11\fm 4,
without specifying the type of variability. In the Guide Star Catalogue,
NSV\,08513 is a star with a photographic magnitude of 10.75 $\pm$ 0.28.
This magnitude value was determined from photographic plates taken with
the U.K. SERC Schmidt Telescope using a GG\,395 filter and a IIIaJ
photographic emulsion. The spectral information recorded in the NSV
catalogue indicates that the  spectral type of NSV\,08513 is A1.

To confirm its variability, NSV\,08513 was observed in the V band for 24
nights, from 14 June  to 13 September 1996, using a CCD camera
attached to a 0.2-m telescope from Zaragoza and Morata de Jalon
(Spain). GSC\,5066.0580 and GSC\,5066.0188 were used as comparison and
check stars respectively. Photometric reductions suggest that the check star
might be slightly variable. It is planned to monitor this object in the near
future to check its variability.
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\centerline{Figure 1}
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\centerline{2}
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Observations show that NSV\,08513 is a detached eclipsing binary star with 
a period close to 1.8 days (see Figure 1). The depth of the primary minimum 
in the V band is 0\fm 77 $\pm$ 0\fm 02. The secondary minimum is about 0.02 
magnitudes shallower (Figure 1). The following ephemeris has been computed:
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\centerline{Min. I = HJD\,2450265.4518  +  1\fd 7631 $\times$ E}
\hspace*{7.4cm}$\pm$0.0010 $\pm$\ 0.0005
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\beginauthors
\authorsrightcol
Antonio LASALA-GARCIA
Grup d'Estudis Astronomics
Apartado 9481
08080 Barcelona
Spain
e-mail: alasala@astro.gea.cesca.es
\endauthors


\references

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

 Strohmeier, W., Kippenhahn, R., Geyer, E., 1957, {\it KVB},  No.\,18

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