\documentstyle[twoside,epsf]{article}

\input ibvs2.sty

\begin{document}

\IBVShead{5770}{7 May 2007}

\IBVStitle{Elements for 10 RR Lyrae Stars}

\IBVSauth{H\"{a}ussler, K.$^1$; Berthold, T.$^{1, 2}$; Kroll, P.$^2$}

\IBVSinst{Bruno-H.-B\"{u}rgel-Sternwarte, T\"{o}pelstr.\ 46, D-04746
Hartha, Germany}

\IBVSinst{Sternwarte Sonneberg, Sternwartestr.\ 32, D-96515 Sonneberg,
Germany}

\IBVSinsto{email: sternwartehartha@lycos.de, tb@4pisysteme.de, pk@4pisysteme.de}

\SIMBADobj{V550 Her}
\SIMBADobj{V551 Her}
\SIMBADobj{V552 Her}
\SIMBADobj{V555 Her}
\SIMBADobj{V556 Her}
\SIMBADobj{V557 Her}
\SIMBADobj{V562 Her}
\SIMBADobj{V626 Her}
\SIMBADobj{V659 Her}
\SIMBADobj{V763 Oph}

\begintext

These stars were discovered and reported to be of RR Lyrae type by Boyce \& Huruhata (1942)
and Hoffmeister (1966, 1967, 1968). Except for V552 Her and V659 Her (see details noted in the
remarks below), no further observations or ephemeris have been published until today.
Photographic plates of a field centered at alpha Oph, taken with the Sonneberg Observatory
40-cm Astrographs during three intervals spread over the years from 1964 to 1994, were used to
investigate the behaviour of these objects (see Table~1).

\begin{center}
Table 1. Summary of this paper
\smallskip
\begin{tabular}{lcrrrrcc}
\hline
Star   & Type &  Epoch    &Period &Max. & Min. & $M-m$ & No.\ of \\
       &      & 2400000+ & (day)  &     &      &     & Plates   \\
\hline
V550 Her     & RRab  &49475.463     & 0.5603952      & 15\fmm1 & 16\fmm4  & 0\fper19 &203 \\
             &       &   $\pm$9     &    $\pm$8      &         &          &          &\\
V551 Her     & RRab  &49076.570     & 0.4365392      & 14\fmm5 & 16\fmm4  & 0\fper21 &235 \\
             &       &   $\pm$8     &    $\pm$5      &         &          &          &\\
V552 Her     & RRab  &49124.456     & 0.3785196      & 11\fmm2 & 12\fmm8  & 0\fper17 &297 \\
             &       &   $\pm$4     &    $\pm$2      &         &          &          &\\
V555 Her     & RRab  &49213.346     & 0.5839040      & 15\fmm3 & 16\fmm5  & 0\fper20 &240 \\
             &       &   $\pm$7     &    $\pm$6      &         &          &          &\\
V556 Her     & RRab  &47265.573     & 0.4775347      & 14\fmm5 & 15\fmm4  & 0\fper19 &265 \\
             &       &   $\pm$8     &    $\pm$7      &         &          &          &\\
V557 Her     & RRab  &49488.536     & 0.6114131      & 13\fmm5 & 14\fmm2  & 0\fper18 &287 \\
             &       &   $\pm$9     &    $\pm$9      &         &          &          &\\
V562 Her     & RRab  &49484.471     & 0.4653154      & 14\fmm1 & 15\fmm5  & 0\fper20 &199 \\
             &       &   $\pm$7     &    $\pm$7      &         &          &          &\\
V626 Her     & RRab  &49076.609     & 0.5871079      & 14\fmm5 & 15\fmm5  & 0\fper18 &194 \\
             &       &  $\pm$10     &   $\pm$13      &         &          &          &\\
V659 Her     & RRab  &53891.711     & 0.5164255      & 13\fmm8 & 15\fmm1  & 0\fper19 &276 \\
             &       &   $\pm$9     &    $\pm$4      &         &          &          &\\
V763 Oph     & RRab  &49076.563     & 0.4439681      & 14\fmm7 & 16\fmm0  & 0\fper16 &254 \\
             &       &   $\pm$7     &    $\pm$5      &         &          &          &\\
\hline
\end{tabular}
\end{center}

The given elements were obtained by means of least-squares solutions. Photographic amplitudes
were derived with respect to magnitudes of the comparison stars given in Table 2. An extensive
list holding the times of maxima derived can be retrieved as {\tt 5770-t3.txt}, using the link
in the HTML version of this paper.  Individual data are available upon request.
 \IBVSedata{5770-t3.txt}
 \IBVSdataKey{5770-t3.txt}{V550 Her, V551 Her, V552 Her, V555 Her, V556 Her, V557 Her, V562 
Her, V626 Her, V659 Her, V763 Oph}{maxima times}

\begin{table}[!ht]
\begin{center}
Table 2. Comparison stars and cross references
\smallskip
\normalsize
\begin{tabular}{ccrcr}
\hline
    &  V550 Her         &     &  V551 Her           &     \\
    & S 9802            &     &  S 9804             &     \\
    & USNO 1050-08668833&     &  USNO 0975-09236295 &     \\
\hline
Comp.\ No.  &  USNO      & $m^*$     & USNO          & $m^*$ \\
\hline
1   &  1050-08669099    &  14\fmm9  & 0975-09240518 & 14\fmm6\\
2   &  1050-08671787    &  15\fmm2  & 0975-09231390 & 14\fmm8\\
3   &  1050-08671790    &  15\fmm6  & 0975-09237192 & 15\fmm6\\
4   &  1050-08670689    &  16\fmm8  & 0975-09236592 & 16\fmm8\\
\hline
&&&&\\
\hline
    &  V552 Her            &     & V555 Her         &\\
    &  S 9806              &     & S 8623           &\\
    &  GSC 1004 993        &     & USNO 1050-08969873&\\
\hline
Comp.\ No.  &  USNO    & $m^*$      & USNO          & $m^*$\\
\hline
1   &  GSC 1004 603     & 10\fmm67& 1050-08972384& 15\fmm1\\
2   &  GSC 1004 2003    & 11\fmm55& 1050-08971269& 15\fmm5\\
3   &  GSC 1004 1692    & 12\fmm55& 1050-08970928& 16\fmm1\\
4   &  GSC 1004 1833    & 12\fmm67& 1050-08969012& 16\fmm6\\
\hline
&&&&\\
\hline
    &  V556 Her          &     & V557 Her           &\\
    &  S 8627            &     & S 9824           &\\
    &  USNO 0975-09653264&     & USNO 1050-09117461&\\
\hline
Comp.\ No.  &  USNO   & $m^*$      & USNO          & $m^*$\\
\hline
1   &  0975-09660147 & 14\fmm5& 1050-09116433& 13\fmm3\\
2   &  0975-09653655 & 14\fmm7& 1050-09121021& 13\fmm7\\
3   &  0975-09653142 & 15\fmm1& 1050-09117300& 13\fmm9\\
4   &  0975-09652715 & 15\fmm4& 1050-09116424& 14\fmm5\\
\hline
&&&&\\
\hline
    &  V562 Her          &     & V626 Her           &\\
    &  S 9830            &     & S 10350           &\\
    &  USNO 1050-09311278&     & USNO 0975-09955355&\\
\hline
Comp.\ No.  &  USNO   & $m^*$      & USNO          & $m^*$\\
\hline
1   &  1050-09309572 & 13\fmm9& 0975-09957358& 14\fmm2\\
2   &  1050-09312674 & 14\fmm0& 0975-09948638& 14\fmm5\\
3   &  1050-09312330 & 14\fmm8& 0975-09955218& 15\fmm3\\
4   &  1050-09311285 & 15\fmm6& 0975-09956666& 15\fmm7\\
\hline
&&&&\\
\hline
    &  V659 Her          &     & V763 Oph           &\\
    &  S 8619            &     & HV 10945           &\\
    &  USNO 0975-09311040&     & USNO 0975-09245600&\\
\hline
Comp.\ No.  &  USNO   & $m^*$      & USNO          & $m^*$\\
\hline
1   &  0975-09305418 & 13\fmm7& 0975-09244389& 14\fmm6\\
2   &  0975-09318049 & 14\fmm2& 0975-09243330& 15\fmm2\\
3   &  0975-09312948 & 14\fmm6& 0975-09248801& 15\fmm5\\
4   &  0975-09310612 & 15\fmm5& 0975-09244653& 16\fmm2\\
\hline
&&&&\\
\end{tabular}

{\normalsize $^*$ Magnitudes refer to the $B$ values of the 
USNO$-$A2.0 catalogue}
\end{center}
\end{table}

\IBVS2fig{7cm}{5770-f1.ps}{Light curve of V550 Her}{5770-f2.ps}{Light
curve of V551 Her}
\IBVSfigKey{5770-f1.ps}{V550 Her}{light curve}
\IBVSfigKey{5770-f2.ps}{V551 Her}{light curve}

\IBVS2fig{7cm}{5770-f3.ps}{Light curve of V552 Her}{5770-f4.ps}{Light
curve of V555 Her}
\IBVSfigKey{5770-f3.ps}{V552 Her}{light curve}
\IBVSfigKey{5770-f4.ps}{V555 Her}{light curve}

\IBVS2fig{7cm}{5770-f5.ps}{Light curve of V556 Her}{5770-f6.ps}{Light
curve of V557 Her}
\IBVSfigKey{5770-f5.ps}{V556 Her}{light curve}
\IBVSfigKey{5770-f6.ps}{V557 Her}{light curve}

\IBVS2fig{7cm}{5770-f7.ps}{Light curve of V562 Her}{5770-f8.ps}{Light
curve of V626 Her}
\IBVSfigKey{5770-f7.ps}{V562 Her}{light curve}
\IBVSfigKey{5770-f8.ps}{V626 Her}{light curve}

\IBVS2fig{7cm}{5770-f9.ps}{Light curve of V659 Her}{5770-f10.ps}{Light
curve of V763 Oph}
\IBVSfigKey{5770-f9.ps}{V659 Her}{light curve}
\IBVSfigKey{5770-f10.ps}{V763 Oph}{light curve}

{\em Remarks:}
\vskip 1mm
{\em V552 Her}

First elements were derived from Northern Sky Variability Survey data (NSVS 10885457, Max
(hel) = J.D. 2451338.78 + 0\fday37854) by Wils et al.\ (2006).

\vskip 1mm
{\em V659 Her}

In addition to our observations three further maximum times were derived from ASAS data (ASAS
173053+1421.9, J.D. hel.\ 2453817.862, 2453832.835 and 2453891.700) and used for this period
analysis.


This research made use of the SIMBAD data base, operated by the CDS
at Strasbourg, France.

\references

Boyce, E.H., Huruhata, M., 1942, {\it Harvard Annals}, {\bf 109}, 19

Hoffmeister, C., 1966, {\it Astron.\ Nachr.}, {\bf 289}, 1

Hoffmeister, C., 1967, {\it Astron.\ Nachr.}, {\bf 290}, 43

Hoffmeister, C., 1968, {\it Astron.\ Nachr.}, {\bf 290}, 277

The All Sky Automated Survey, {\tt http://archive.princeton.edu/\~{}asas}

Wils, P., Lloyd, C., Bernhard, K., 2006, {\it Mon.\ Not.\ R. Astron.\ Soc.}, {\bf 368}, 1757

\endreferences

\end{document}
