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\IBVShead{4356}{29 July 1996}

\title{NSV\,09136, AN RR LYRAE TYPE STAR IN OPHIUCHUS}
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\begintext 

 NSV\,09136 (= HV\,10972 = CSV\,003258 = GSC\,0996.0190) was announced as a
variable star by Hughes-Boyce and Huruhata (1942). According to
Kholopov (1982), this object is an RR Lyrae star with a photographic 
magnitude variation from 13\fm 5 to 14\fm 3. No additional information 
is given.

 For 18 days, from 14 May 1996 to 10 June 1996, NSV 09136 was observed in 
the V band using a Starlight Xpress CCD camera attached to the Newtonian
focus of the 0.5-m telescope at l'Ametlla del Valles Observatory (Spain).
GSC \,0996.1153 and GSC\,0996.1153 were used as comparison and check stars 
respectively (Figure 1).

 Observations showed that NSV\,09136 is, in fact, an RR Lyrae star with an
amplitude of 0\fm 95 in the V band, an asymmetry factor (M$-$m)/P=0.12, and a
period over 16.5 hours (Figure 2). Photometric measurements may be
slightly affected by crowding due to the fact that there is a faint star 
close to the variable, which not always could be satisfactorily excluded 
in the synthetic aperture reduction process.
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\centerline{Figure 1. V=NSV\,09136, C=Comparison star, Ck=Check star. North is on top}
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\centerline{2}
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\centerline{Figure 2}
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 The following ephemeris has been also derived:
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\centerline{Max. = HJD 2450241.467 + 0\fd 6966 $\times$ E}
\hspace*{71mm}   $\pm$0.002   $\pm$0.0003
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\beginauthors
\authorsrightcol
Antonio GARRIGOS SANCHEZ
Grup d'Estudis Astronomics
Apartado 9481
08080 Barcelona
Spain
e-mail:gea@astro.gea.cesca.es
\endauthors

\references

Hughes-Boyce, E., Huruhata, M., 1942, Annals of the Astronomical
  Observatory of the Harvard College 109, No.\,4

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


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