\documentclass[twoside]{article}
\usepackage{epsfig}

\input ibvs2.sty
\input ibvst.sty

\begin{document}
\IBVShead{5335}{12 November 2002}

\IBVStitle{Identification and Light Elements of BW L\lowercase{ib}}

\IBVSauth{Sokolovsky, K. V.$^{1}$; Samus, N. N.$^{2,1}$}

\IBVSinst{Sternberg Astronomical Institute, 13, University Ave., Moscow 119992, Russia}

\IBVSinst{Institute of Astronomy, Russian Academy of Sciences,
48, Pyatnitskaya Str., Moscow 119017, Russia, \\
e-mail: samus@sai.msu.ru}

\SIMBADobj{BW Lib} 
\IBVStyp{ EA } 

\IBVSabs{We present a corrected finding chart and the results of} \
\IBVSabs{a new photographic study for the short-period Algol} 
\IBVSabs{variable BW Lib.}

\begintext

\IBVSTnam{BW Lib = GSC 6192.1522}

\IBVSTcoo{15\hr31\mm40\fsec08}{$-$20\deg27\arcm17\farcs5}{2000}

\IBVSTobs{Crimean Laboratory of Sternberg Astronomical Institute, 40-cm
astrograph}

\IBVSTdet{Photoplate}

\IBVSTfil{None}

\IBVSTcomp{
 \begin{tabular}{cccc}
 \noalign{\smallskip} GSC & $\alpha$ (J2000) &
                      $\delta$ (J2000) & $B_{pg}$ \\
 \noalign{\smallskip}
 \hline
 \noalign{\smallskip}
6192.1322 & 15\hr32\mm08\fsec3 & --20\deg19\arcm55\arcs & 13\fmm33 \\
6192.0857 & 15\hr31\mm53\fsec8 & --20\deg27\arcm55\arcs & 14\fmm31 \\
6192.1144 & 15\hr31\mm47\fsec4 & --20\deg28\arcm08\arcs & 15\fmm03 \\
 \noalign{\smallskip}
 \end{tabular}
}

\IBVSTsys{$B_{\rm pg}$}{Calibrated using the photoelectric standard
sequence in NGC~5897 (Sandage and Katem, 1968)}

\IBVSTdateobs{JD 2440413--2448425}

\IBVSTdata{Upon request}

\IBVSTtyp{ EA }

\IBVSTrem{The eclipsing variable star BW Lib (HV 10673) was
discovered by Hanley (1942) who mentioned the presence of a faint
companion to the north-west. Ashbrook (1942) gives the
photographic light range from 13\fmm2 to 14\fmm9 and the period
0\fday93235. No timings of minima were ever published for the
star. A finding chart was presented by Tsesevich and Kazanasmas
(1971). It shows a star approximately in 2\arcm\ of the
discoverer's position. However, there is a candidate star
GSC~6192.1522 close to the position published by Hanley~(1942)
and with a companion agreeing with the description. We looked
through several plates of our collection and immediately found a
deep minimum on HJD~2440413.311 (in fact, the deepest minimum on
our plates). Later on, our identification was confirmed by a
finding chart based upon the discoverer's sketch and kindly sent
to us by Dr.~M.L.~Hazen (Harvard Observatory). The best values of
the period derived from the total of our 77 photographic
brightness estimates do not differ significantly from that
published by Ashbrook (1942), and thus we suggest the following
light elements: \\Min~JD~hel = 2440413.311 + 0\fday93235$\times E$.
The finding chart is shown in Fig.~1, the light curve is
presented in Fig.~2. The wrong chart by Tsesevich and Kazanasmas
identifies BW~Lib with one of our comparison stars,
GSC~6192.1144.}


\IBVSTack{The work of the GCVS team is supported, in part, by
grants from the Russian Foundation for Basic Research (grant
02-02-16069), The Federal Scientific and Technological Program
``Astronomy'', and the program of support for leading scientific
schools of Russia (00-15-96627). The Digitized Sky Survey images
are provided by the Hubble Space Telescope Science Institute
under support from grant NAG W-2166 of the USA Government. Thanks
are due to Dr.~M.L.~Hazen for sending us the finding chart
confirming our identification and to Dr.~S.V.~Antipin for his
assistance during the preparation of the manuscript.}

\vspace*{1cm}

\IBVSfig{8cm}{5335-f1.eps}{The finding chart for BW Lib. The chart
shows a $4\arcm\times4\arcm$ field from the second Digitized Sky Survey,
in red light. The star marked ``C'' is GSC~6192.1144, erroneously
identified with BW~Ser in Tsesevich and Kazanasmas (1971).}
%IBVSfigKey{5335-f1.eps}{BW Lib}{finding chart}

\IBVSfig{8cm}{5335-f2.eps}{The light curve of BW Lib, folded with
the elements presented above.}
%IBVSfigKey{5335-f2.eps}{BW Lib}{light curve}


\references

Ashbrook, M. D., 1942, {\it Harvard Obs. Ann.}, {\bf 109}, 31

Hanley, C. M., 1942, {\it Harvard Obs. Ann.}, {\bf 109}, 15

Sandage, A., Katem, B., 1968, {\it Astrophys. J.}, {\bf 153}, 569

Tsesevich, V. P., Kazanasmas, M. S., 1971, {\it Atlas of Finding
Charts of Variable Stars}, Moscow: Nauka

\endreferences


\end{document}
