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\input ibvs2.sty
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\begin{document}

\IBVShead{5349}{4 December 2002}

\IBVStitle{Times of Light Maxima of Some RR\lowercase{ab} Stars}

\IBVSauth{Szeidl, B.; P\'ocs, M. D.}

\IBVSinsto{Konkoly Observatory, Budapest, Hungary; e-mail: szeidl@konkoly.hu, pocs@konkoly.hu}

\IBVStyp{ RRAB }
\IBVSkey{times of maxima, RRab}
\SIMBADobj{XX And}
\SIMBADobj{X Ari}
\SIMBADobj{ST Boo}
\SIMBADobj{S Com}
\SIMBADobj{UY Cyg}
\SIMBADobj{SW Dra}
\SIMBADobj{SZ Gem}
\SIMBADobj{VX Her}
\SIMBADobj{RR Leo}
\SIMBADobj{V LMi}


\begintext

Seventy years ago L. Detre initiated a systematic photometry survey of bright
northern RR Lyrae stars in order to discover secondary periodicities in their
pulsation. Since 1954 the observations have been carried out
photoelectrically with the 60 cm Newton telescope at Budapest, Sv\'abhegy (in
integrated light in the first three years) and later, since 1972
the 50 cm Cassegrain telescope at Piszk\'estet\H o, Mountain station was also
used to the photometry. The
observations were made by the staff of the observatory (mostly by L. Csank,
L. Detre, K. Gefferth, M. Lovas, K. Ol\'ah and B. Szeidl).

The results on RRab stars with stable light curves have partly been
published (AN Ser: Kany\'o \& Szeidl 1974; AT And, SU Dra, RR Leo, TT Lyn,
AR Per: Ol\'ah \& Szeidl 1978; TW Her, VZ Her, AV Peg, TU UMa: Szeidl et al.
1986). In Table 1 we collected the times of light maxima of the rest of the
RRab stars with stable light curves ever observed photoelectrically
at Konkoly Observatory. These data might be useful in constructing their $O-C$
diagrams. The times given in Table 1 are mean values of the blue and yellow
maximum times. (An asterisk in Table 1 indicates that the observations were
made in integrated light.)

\begin{table}
\caption[]{}
\begin{center}
 \begin{tabular}{rrlrrl}
 \noalign{\smallskip}
Star name & Times of maxima         & & Star name & Times of maxima       & \\
          & \multicolumn{1}{c}{HJD} & &           & \multicolumn{1}{c}{HJD}& \\
 \hline
          &                         & &           &                       & \\
XX And    & 2436141.5267*           & &    UY Cyg & 36397.5250\phantom{*} & \\
          & 36144.4176\phantom{*}   & &           & 36452.4741\phantom{*} & \\
          & 36157.4269\phantom{*}   & &           & 36788.3365\phantom{*} & \\
          & 36451.5846\phantom{*}   & &           & 36790.5800\phantom{*} & \\
          & 36819.4634\phantom{*}   & &           & 40428.4395\phantom{*} & \\
          & 39381.6014\phantom{*}   & &           & 40438.5287\phantom{*} & \\
          & 39389.5510\phantom{*}   & &           & 45896.4495\phantom{*} & \\
          & 39418.4600\phantom{*}   & &           &                       & \\
          & 40500.4147\phantom{*}   & &    SW Dra & 2435238.4795*         & \\
          & 40515.5918\phantom{*}   & &           & 35561.4846*           & \\
          & 41605.5121\phantom{*}   & &           & 35562.6230*           & \\
          & 41983.5145\phantom{*}   & &           & 35569.4597*           & \\
          & 45604.5560\phantom{*}   & &           & 36613.6692\phantom{*} & \\
          &                         & &           & 36616.5181\phantom{*} & \\
X Ari     & 2442403.3775\phantom{*} & &           & 36644.4333\phantom{*} & \\
          &   42716.5439\phantom{*} & &           & 43578.4700\phantom{*} & \\
          &   43459.5025\phantom{*} & &           &                       & \\
          &   44172.5208\phantom{*} & &    SZ Gem & 2436605.3781\phantom{*} & \\
          &   45622.6365\phantom{*} & &           & 36614.3989\phantom{*} & \\
          &                         & &           & 37315.4909\phantom{*} & \\
ST Boo    & 2435127.6595*           & &           & 39536.5271\phantom{*} & \\
          &   36673.4502\phantom{*} & &           &                       & \\
          &   36696.4758\phantom{*} & &    VX Her & 2436744.4685\phantom{*} & \\
          &                         & &           & 40422.4710\phantom{*} & \\
S Com     & 2436670.5335\phantom{*} & &           &                       & \\
          &   36672.2910\phantom{*} & &    RR Leo & 2443560.5004\phantom{*} & \\
          &   36693.4080\phantom{*} & &           & 43911.5572\phantom{*} & \\
          &                         & &           &                       & \\
UY Cyg    & 2435284.5260*           & &    V LMi  & 2436629.5110\phantom{*} & \\
          &   35338.3540*           & &           & 36630.5979\phantom{*} & \\
          &   36351.5478\phantom{*} & &           &                       & \\

\end{tabular}
\end{center}
{\bf Remark:}
ST Boo is probably an RR Lyrae star with Blazhko effect (Lange \&
Firmanyuk 1975).
\end{table}

The RRab stars which exhibited Blazhko effect (RS Boo, TT Cnc, Z CVn, XZ
Cyg, RW Dra, XZ Dra, DL Her, RR Gem, RR Lyr, BH Peg, AR Ser, RV UMa) were
observed more regularly. The observations of some of these stars have already
been published (RS Boo: Kany\'o 1986; RW Dra: Szeidl et al. 2001b; XZ
Dra: Szeidl et al. 2001a; RR Lyr: Szeidl et al. 1997; RV UMa: Kany\'o 1976).

\IBVSTack{This work has been partly supported by the OTKA grant T30954.}


\references

Kany\'o, S. 1976, {\it Comm. Konkoly Obs.}, No. 69 \ADSBIBCODE{1976CoKon..69....1K}

Kany\'o, S. 1986, {\it Comm. Konkoly Obs.}, No. 87 \ADSBIBCODE{1986CoKon..87....1K}

Kany\'o, S. \& Szeidl, B., 1974, {\it Comm. Konkoly Obs.}, No. 64 \ADSBIBCODE{1974CoKon..64....1K}

Lange, G. A. \& Firmanyuk, B. N., 1975, {\it Astr. Tsirk.}, {\bf No. 864}, 7

Ol\'ah, K. \& Szeidl, B., 1978, {\it Comm. Konkoly Obs.}, No. 71 \ADSBIBCODE{1978CoKon..71....1O}

Szeidl, B., Guinan, E. F., Ol\'ah, K. \& Szabados, L., 1997, {\it Comm. Konkoly Obs.}, No. 99 \ADSBIBCODE{1997CoKon..99....1S}

Szeidl, B., Jurcsik, J., Benk\H o, J. \& Bakos, G. \'A., 2001a, {\it Comm. Konkoly Obs.}, No. 101 \ADSBIBCODE{2001CoKon.101....1S}

Szeidl, B., Ol\'ah, K., Barlai, K. \& Szabados L., 2001b, {\it Comm. Konkoly Obs.}, No. 102 \ADSBIBCODE{2001CoKon.102....1S}

Szeidl, B., Ol\'ah, K. \& Mizser, A., 1986, {\it Comm. Konkoly Obs.}, No. 89 \ADSBIBCODE{1986CoKon..89...57S}

\endreferences
 

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