\documentstyle[twoside, epsf]{article}

\input ibvs2.sty
\input ibvst.sty

\begin{document}

\IBVShead{4830}{21 January 2000}

\IBVStitle{Revised Period and First Epoch of V1584 C\lowercase{yg}}

\IBVSauth{Jassur, D.M.Z.; Kermani, M.H.}

\IBVSinsto{Faculty of Physics, Tabriz University, Tabriz, Iran, e-mail: jassur@ark.tabrizu.ac.ir}

\SIMBADobjAlias{HD 193722}{V1584 Cyg}

\begintext

\IBVSTnam{V1584 Cyg = HD 193722}

\IBVSTcoo{20\hr19\fmm9}{46\deg50\arcm}{2000}

\IBVSTobs{Khajeh Nassir Aldin Observatory, 40-cm reflector}

\IBVSTdet{P.M. (RCA 1P21)}

\IBVSTfil{$UBV$}

\IBVSTcomp{HD 193536}

\IBVSTchk{HD 192802}

\IBVSTsysn

\IBVSTdata{Upon request} 

\IBVSTtyp{ Hot Ap star }

\IBVSTrem{
$UBV$ photometric observations of the silicon star V1584 Cygni were carried out on eight clear nights from July till September 1997. A total of 350 points were obtained in each filter. Individual observations were averaged over phase range 0.02 to obtain 50 normal points. 
Aslanov et al. (1989) gave 1.132854 days for period. To find the revised rotational period, we have fitted a sinusoidal wave function separately to the normal points of $UBV$ filters. Using this method
we have found the rotational period averaged over three filters to be
$1.169\mathbin{(\pm}0.0003)$ days. The epoch of minimum light turned out to be \belowdisplayskip-12pt
$$ {\rm HJD(Min)}=2450621.3275\mathbin{(\pm}0.0003). $$}

\IBVSTack{
Financial support from Tabriz University (Iran) is acknowledged.}

\IBVSfig{9cm}{4830-f1.eps}{}

\reference

Aslanov, I.A., Hildebrandt, G., Khokhlova, V.L., Sch\"oneich, W., 1973, Astrophys.\ Space Sci., {\bf 21}, 477
% In the original paper the second and fourth author was erroneously given as 
%Heildebrandt, G. and Sh\"oneich, W.

\end{document}

