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\IBVShead{5249}{4 April 2002}

\IBVStitle{NSV 786 is not a cataclysmic variable}


\IBVSauth{STANISHEV, V.}

\IBVSinsto{Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Shosse Blvd., 1784 Sofia, Bulgaria 
e-mail vall@astro.bas.bg}

\SIMBADobjJ2000{NSV 786}{02 22 22.62 +78 54 37.8}
\IBVStyp{ cataclysmic }
\IBVSkey{spectroscopy, cataclysmic variables}
\IBVSabs{The spectrum of NSV 786 around H-alpha shows that the star is not}
\IBVSabs{a cataclysmic variable. The spectrum suggests a late F star, while}
\IBVSabs{the second brightest star in the field is probably a K5 giant.}


\begintext

Along with the well known cataclysmic variables (CVs), the catalog of Downes et
al. (1997) provides a large sample of stars suspected to be CVs. 
Among them there are still several relatively bright stars 
without published spectra. One of them is Cep2 (NSV 786). The TYCHO catalogue
provides $V_T=10\fmm09$ and $B_T-V_T=0\fmm53$ thus the star is probably not a CV. However, this has
to be spectroscopically confirmed. On 22~January~2002 single spectra of 
NSV 786 and star \#1 in Fig. 1 (which also has no spectral classification) 
around H$\alpha$ were obtained
with the Coud\'e spectrograph of the 2-m telescope at Rozhen Observatory. 
The spectra showed neither H$\alpha$ emission nor broad absorption (the later
is observed in some UX UMa novalikes). Therefore neither star is a CV. 
A comparison with the spectral atlas of Montes et al. (1999) shows 
that the spectrum of star \#1 closely matches that of a K5 giant, while 
NSV 786 itself is a late F star, most probably F8. 
This spectral classification of NSV 786 is fairly well consistent with 
the $B_T-V_T$ color index provided by TYCHO.


\IBVSfig{5cm}{5249-f1.eps}{Finding chart and the spectra of NSV 786 and star \#1 around H$\alpha$.}

\IBVSefigure{5249-f1a.eps}


\references

Downes, R., Webbink, R.F., Shara, M.M, 1997, {\it PASP}, 109, 345

Montes, D., Ramsey, L.W., Welty, A.D., 1999, {\it ApJS}, 123, 283

\endreferences


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