\documentstyle[twoside,ibvs2]{article}

\begin{document} 

\IBVShead{5027}{7 February 2001}

\IBVStitletl{Times of Minima of Eclipsing Binaries}{ from ROTSE1 CCD Data I: Named Variables}

\IBVSauth{Diethelm, R.}

\IBVSinsto{BBSAG and Astron.\ Institut der Universit\"at Basel, Rennweg
1, CH-4118 Rodersdorf, Switzerland\\ \indent e-mail: diethelm@astro.unibas.ch}

\IBVStyp{ E }
\IBVSkey{CCD photometry}

\begintext

The ROTSE-1 survey (Robotic Optical Transient Search Experiment 1),
designed for the detection of astrophysical transients, especially
those associated with gamma-ray bursts, has yielded a large amount of
CCD data on variable stars, as reported in Akerlof et al.\ (2000). With
permission of the ROTSE-1 team, we have used these measurements publicly
available through the internet (http://www.umich.edu/\~{}rotse) to
determine the times of minimum of eclipsing binaries.

In Table 1, the derived times are presented for the named variables
according to the General Catalogue of Variable Stars. In each case, the
data have been folded into a seasonal light curve using the best
available elements of variation. In most cases, we used either the data
from the latest edition of the General Catalogue of Variable Stars or
the more actual ephemerides in SAC 72 (Rocznik Astronomiczny
Obserwatorium Krakowskiego, 2001) or from other sources in the
literature. Where no previous elements of variation were known, we
employed the period values given in the ROTSE1 data base. It should be
noted, that the GCVS periods for DP Herculis and ES Herculis are to be
preferred over the ROTSE1 values.  The time of minimum was then found
with the help of the Kwee-Van Woerden algorithm (Kwee and Van Woerden,
1956).

We would like to express our gratitude towards the ROTSE team for
making their data available to the general public. In addition, the
cross-reference table provided by B. Skiff through M. Baldwin of the
AAVSO is thankfully acknowledged. It proved to be very helpful for the
identification of the ROTSE sources.

\references

Akerlof, C., Amrose, S., Balsano, R., Bloch, J., Casperson, D., Fletcher,
S., Gisler, G., Hills, J., Kehoe, R., Lee, B., Marshall, S., McKay, T.,
Pawl, A., Schaefer, J., Szymanski, J., Wren, J., 2000, {\it AJ}, {\bf 119}, 1901

Kwee, K.K., Van Woerden, H., 1956, {\it Bull.\ Astron.\ Inst.\ Neth.}, {\bf
12}, 327

\endreferences

\vfill
\IBVSerratum{4982}

In IBVS No.~4982 the period of GSC 2646.1938 should read 0\fday2890550 instead of 0\fday2860550.


\begin{table}
\caption{Times of minima of eclipsing binaries}
\begin{center}
\normalsize
\begin{tabular}{lcll|lcll}
\hline
Star & Type & JD(hel,\,min) & Est.\ error &
Star & Type & JD(hel,\,min) & Est.\ error \\
\hline
TU Boo & p & 2451246.8098 & 0\fday0021 & OS Her & p & 2451304.7322 & 0\fday0029\\
 & s & 2451338.7443 & 0.0028 & V342 Her & p & 2451275.8470 & 0.0011\\
TY Boo & p & 2451339.7500 & 0.0004 &  & s & 2451295.866 & 0.003\\
AR Boo & p & 2451305.7312 & 0.0021 & V366 Her & p & 2451306.706 & 0.024\\
 & s & 2451320.7360 & 0.0008 &  & s & 2451310.8874 & 0.0015\\
CV Boo & p & 2451258.8651 & 0.0008 & V381 Her & s & 2451258.876 & 0.005\\
 & s & 2451339.7597 & 0.0006 &  & p & 2451310.762 & 0.004\\
EW Boo & p & 2451225.9064 & 0.0014 & V387 Her & p & 2451307.7584 & 0.0007\\
RV CVn & p & 2451247.8110 & 0.0005 &  & s & 2451312.769 & 0.004\\
 & s & 2451334.7461 & 0.0004 & V412 Her & s & 2451283.788 & 0.005\\
YZ CVn & s & 2451247.8728 & 0.0016 &  & p & 2451295.724 & 0.005\\
 & p & 2451310.7319 & 0.0013 & V450 Her & s & 2451295.7100 & 0.0025\\
BI CVn & p & 2451258.6944 & 0.0008 &  & p & 2451305.717 & 0.004\\
 & s & 2451277.7129 & 0.0008 & V477 Her & p & 2451287.713 & 0.002\\
RW Com & s & 2451258.7015 & 0.0004 &  & s & 2451287.8769 & 0.0011\\
 & p & 2451288.7288 & 0.0003 & V502 Her & p & 2451280.8461 & 0.0015\\
RZ Com & s & 2451281.9016 & 0.0003 &  & s & 2451306.8870 & 0.0012\\
 & p & 2451312.8758 & 0.0004 & V663 Her & s & 2451260.891 & 0.003\\
EK Com & p & 2451288.8642 & 0.0002 &  & p & 2451288.8684 & 0.0016\\
 & s & 2451340.7354 & 0.0004 & V681 Her & p & 2451274.9033 & 0.0011\\
TW CrB & s & 2451283.7764 & 0.0008 & V687 Her & p & 2451258.8624 & 0.0014\\
 & p & 2451311.7468 & 0.0009 &  & s & 2451283.7749 & 0.0013\\
V753 Cyg & p & 2451274.8715 & 0.0016 & V719 Her & p & 2451283.7341 & 0.0019\\
 & s & 2451304.8680 & 0.0008 & V728 Her & p & 2451285.6920 & 0.0004\\
V850 Cyg & s & 2451243.886 & 0.013 &  & s & 2451305.7220 & 0.0008\\
 & p & 2451259.839 & 0.016 & V731 Her & s & 2451243.9885 & 0.0015\\
V997 Cyg & p & 2451291.8078 & 0.0022 &  & p & 2451310.7184 & 0.0009\\
 & s & 2451304.8548 & 0.0027 & V836 Her & s & 2451259.91 & 0.03\\
V1763 Cyg & s & 2451283.7514 & 0.0010 &  & s & 2451306.80 & 0.06\\
 & p & 2451312.7292 & 0.0015 & V848 Her & s & 2451262.917 & 0.003\\
V1918 Cyg & s & 2451275.8345 & 0.0016 &  & p & 2451308.8586 & 0.0021\\
 & p & 2451288.8466 & 0.0007 & V857 Her & s & 2451306.7712 & 0.0005\\
AK Dra & p & 2451275.8273 & 0.0012 &  & s & 2451308.8759 & 0.0010\\
DP Her & s & 2451288.740 & 0.010 & TZ Lyr & p & 2451258.8404 & 0.0004\\
 & p & 2451312.748 & 0.003 &  & s & 2451306.7043 & 0.0013\\
TU Boo & p & 2451246.8098 & 0.0021 & EX Lyr & s & 2451296.7667 & 0.0011\\
 & s & 2451338.7443 & 0.0028 & V400 Lyr & s & 2451274.8713 & 0.0012\\
ES Her & p & 2451291.8187 & 0.0020 &  & p & 2451321.8742 & 0.0010\\
 & s & 2451304.7379 & 0.0017 & V404 Lyr & s & 2451308.698 & 0.004\\
GU Her & p & 2451265.7877 & 0.0022 &  & p & 2451312.7094 & 0.0012\\
 & s & 2451280.951 & 0.003 & V406 Lyr & s & 2451265.9702 & 0.0015\\
HP Her & s & 2451288.7143 & 0.0015 &  & p & 2451306.8668 & 0.0015\\
 & p & 2451295.7147 & 0.0015 & V461 Lyr & p & 2451311.789 & 0.013\\
IT Her & p & 2451274.8872 & 0.0013 & V449 Oph & p & 2451306.9022 & 0.0003\\
 & s & 2451296.7743 & 0.0027 &  & s & 2451324.895 & 0.004\\
LT Her & s & 2451287.7312 & 0.0009 & V1125 Oph & p & 2451259.8922 & 0.0020\\
 & p & 2451308.8692 & 0.0007 &  & s & 2451307.753 & 0.004\\
MS Her & s & 2451274.8894 & 0.0012 & & & \\
 & p & 2451297.8952 & 0.00111 & & \\
\hline
\end{tabular}
\end{center}
\end{table}

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