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\IBVShead{5134}{3 July 2001}

\IBVStitletl{Identification of Known and Suspected}{Variables from the ROTSE1 Survey}

\IBVSauth{Wils, Patrick}

\IBVSinsto{Vereniging Voor Sterrenkunde, Belgium (Patrick.Wils@cronos.be)} %email


\begintext

Akerlof et al.\ (2000) published a list of 1781 variables discovered by
the ROTSE1 (Robotic Optical Transient Search Experiment 1) survey. The
complete catalog is available through http://www.umich.edu/\~{}rotse .
By comparing the positions of these stars with positions of known
variable stars from the General Catalogue of Variable Stars (GCVS) to
within 28\farcs8, they identified about 10\% of the stars on their list
as known variables. However, the precision of the positions of some
stars in the GCVS is not better than 1\arcm. Therefore the
identification done with GCVS variables cannot be complete.

By visually inspecting computer plots of the positions of the ROTSE1
stars against stars from the GCVS and the New Catalogue of Variable
Stars (NSV), and verifying candidates with the type of variability and
the magnitude and period if possible, 170 additional identifications
were done which are not registered in the Simbad database (operated at
CDS, Strasbourg, France, http://simbad.u-strasbg.fr/).  The list is
produced in Table 1.

The GCVS stars may be up to 5\arcm\ off the ROTSE1 positions. In fact,
the ROTSE1 catalog provides a more accurate position for these stars
than the GCVS. For some of them, more precise positions have already
been determined before in other papers. The position given by Kinnunen
and Skiff (2000a) for IX Lyr lies about 0\farcm5 south of the ROTSE1
position, and that for OS Her (Kinnunen and Skiff, 2000b) 0\farcm5 to
the north.

Some stars appear twice in the ROTSE1 catalog, with a slightly
different position (probably because they appear in the region of two
overlapping frames). The known variables that correspond to these stars
will in this case appear twice in Table 1.

Table 2 provides an overview of the number of ROTSE1 variables that are
not present in the GCVS or the NSV, for which an identification exists
in the Simbad database, and which have been identified in this paper,
according to the ROTSE1 classification of variability.

The technique used by ROTSE proves to be very efficient in the
discovery of new variables. For short period variables it gives an
immediate estimate of the period (see also Diethelm 2001, for
ephemerides of the new eclipsing binaries discovered by ROTSE). It may
also be valuable in the monitoring of long period variables, which has
been the almost exclusive terrain of visual observers until now. A
large number of maxima and minima of Mira variables may be calculated
from the CCD data.

P. Lampens and P. Van Cauteren are acknowledged for stimulating
discussions.


\begin{table}
\caption{New identifications of known variables and suspected 
variables from the ROTSE1 survey}
\begin{center}
\begin{tabular}{ll|ll}
\hline
ROTSE1 & GCVS & ROTSE1 & GCVS\\
\hline
J124004.01+273014.0 & U Com     & J170831.41+183116.7 & V458 Her  \\ 
J124055.05+370507.0 & SW CVn    & J170913.29+143807.7 & NSV 8243  \\ 
J125110.42+325808.3 & AP CVn    & J171049.24+125250.4 & V461 Her  \\ 
J125421.57+321433.3 & TY CVn    & J171110.02+230011.1 & V462 Her  \\ 
J130236.85+311822.9 & FQ Com    & J171110.07+230009.2 & V462 Her  \\ 
J132942.14+285248.2 & VW CVn    & J171134.15+233630.5 & V464 Her  \\ 
J133430.88+291815.5 & WW CVn    & J171232.71+402826.1 & V725 Her  \\ 
J133455.38+262700.2 & BT Com    & J171249.56+250150.5 & V467 Her  \\ 
J134844.63+334335.3 & RT CVn    & J171250.06+250149.1 & V467 Her  \\ 
J140258.07+253211.8 & BH Boo    & J171339.95+205849.5 & V468 Her  \\ 
J140601.69+243413.2 & CS Boo    & J171432.90+100536.8 & V904 Oph  \\ 
J144739.80+255828.6 & NSV 6808  & J171446.79+100455.7 & V905 Oph  \\ 
J150950.25+265104.7 & NSV 6969  & J171708.50+083929.5 & V740 Oph  \\ 
J151846.68+304945.0 & NSV 20296 & J171734.05+163531.5 & V621 Her  \\ 
J152704.83+294205.9 & NSV 20314 & J171806.51+090802.1 & NSV 8484  \\ 
J160126.57+300221.7 & NSV 7397  & J171830.15+092245.3 & NSV 8495  \\ 
J161021.28+250325.9 & NSV 7509  & J171839.51+281228.3 & KQ Her    \\ 
J161139.19+250101.0 & V681 Her  & J171843.60+130622.3 & NSV 8503  \\ 
J161406.62+235315.4 & V538 Her  & J172022.29+143040.6 & DL Her    \\ 
J162406.76+363548.7 & SV CrB    & J172119.20+083726.6 & NSV 8555  \\ 
J162558.43+174246.7 & V695 Her  & J172119.36+095439.1 & V750 Oph  \\ 
J162908.11+341344.2 & HT Her    & J172308.33+223931.4 & V397 Her  \\ 
J162931.15+182944.5 & V698 Her  & J172502.43+103818.5 & NSV 8622  \\ 
J163630.25+263213.0 & V599 Her  & J172530.05+214452.0 & V485 Her  \\ 
J163738.34+083721.6 & NSV 7865  & J172638.42+265616.5 & V486 Her  \\ 
J163906.52+094756.2 & NSV 7883  & J172725.98+084314.5 & NSV 8773  \\ 
J163945.40+091637.2 & NSV 7891  & J172812.34+102626.2 & V2074 Oph \\ 
J164121.67+122501.7 & V546 Her  & J172836.76+153115.0 & V658 Her  \\ 
J164409.33+251503.7 & AH Her    & J172907.86+184239.8 & FP Her    \\ 
J164409.43+341225.7 & V450 Her  & J173011.66+142233.5 & V552 Her  \\ 
J165020.37+095652.2 & LT Her    & J173016.44+233719.0 & V493 Her  \\ 
J165124.98+081853.8 & NSV 8001  & J173137.58+122524.7 & V769 Oph  \\ 
J165319.42+330958.3 & KO Her    & J173200.87+450142.4 & V495 Her  \\ 
J165505.96+113304.1 & V1125 Oph & J173205.53+394531.1 & V421 Her  \\ 
J170207.62+341251.2 & IN Her    & J173219.79+374414.3 & FQ Her    \\ 
J170236.60+255134.1 & V452 Her  & J173254.71+111831.1 & V776 Oph  \\ 
J170412.89+262019.6 & V454 Her  & J173426.95+321331.1 & NSV 9188  \\ 
J170539.90+213100.5 & V365 Her  & J173640.43+231812.0 & V503 Her  \\ 
J170548.92+333517.6 & V646 Her  & J173903.05+384138.2 & NSV 9450  \\ 
J170621.17+315318.2 & V619 Her  & J173903.25+384135.6 & NSV 9450  \\ 
J170641.03+154032.3 & NSV 8208  & J174056.11+240252.8 & V514 Her  \\ 
J170711.85+361809.4 & NSV 8224  & J174318.65+281514.6 & LX Her    \\ 
J170717.77+130553.7 & NSV 8217  & J174413.83+251453.9 & FS Her    \\ 
\hline
\end{tabular} 
\end{center}
\end{table}

\addtocounter{table}{-1}

\begin{table}
\caption{(cont.)}
\begin{center}
\begin{tabular}{ll|ll}
\hline
ROTSE1 & GCVS & ROTSE1 & GCVS\\
\hline
J174556.16+325133.2 & EH Her    & J183615.60+242928.9 & CI Her \\ 
J174702.36+453941.9 & NSV 9702  & J183652.99+280417.6 & CE Lyr \\ 
J174706.93+383253.6 & NSV 9697  & J183751.21+472324.5 & NSV 11154 \\ 
J174753.92+264121.3 & BK Her    & J183856.81+235824.4 & CL Her \\ 
J174820.33+244227.7 & EI Her    & J183950.26+385856.2 & NSV 11194 \\ 
J175148.02+263845.2 & EL Her    & J184023.50+435622.4 & V480 Lyr \\ 
J175201.83+294008.1 & EM Her    & J184257.98+451819.5 & NSV 11272 \\ 
J175245.38+353921.5 & NSV 9817  & J184301.01+321951.3 & CQ Lyr \\ 
J175338.23+263922.9 & EN Her    & J184413.82+231230.0 & DW Her \\ 
J175355.81+281326.0 & EO Her    & J184506.17+401112.2 & NSV 11321 \\ 
J175510.34+263618.2 & EP Her    & J184717.62+535644.0 & BZ Dra \\ 
J175648.63+255417.7 & ER Her    & J184741.41+383826.6 & NSV 11363 \\ 
J175809.11+411945.0 & V526 Her  & J184813.35+401846.0 & NSV 11371 \\ 
J175809.27+412537.6 & FV Her    & J185126.14+461702.4 & NSV 11453 \\ 
J180012.86+343851.1 & OS Her    & J185231.15+413312.1 & NSV 11476 \\ 
J180350.26+332303.1 & EW Her    & J185304.14+515837.4 & CC Dra \\ 
J180438.84+324141.5 & EY Her    & J185325.94+430918.7 & V355 Lyr \\ 
J180442.64+232238.9 & FX Her    & J185410.14+324957.4 & RX Lyr \\ 
J180507.69+300538.9 & FF Her    & J185507.82+350119.4 & NO Lyr \\ 
J180733.25+401530.1 & PQ Her    & J185546.43+401056.6 & NSV 11565 \\ 
J180955.10+312147.2 & FI Her    & J185805.21+540853.3 & EG Dra \\ 
J181258.35+420345.7 & V442 Her  & J185950.87+452145.9 & V396 Lyr \\ 
J181339.13+372834.2 & V676 Her  & J190048.09+500530.0 & AW Dra \\ 
J181625.83+462753.7 & HI Lyr    & J190234.05+255026.2 & BL Lyr \\ 
J181700.08+344856.0 & HX Lyr    & J190350.47+460144.8 & NSV 11717 \\ 
J182109.33+460854.1 & MX Lyr    & J190359.49+491641.4 & XX Dra \\ 
J182109.56+460900.3 & MX Lyr    & J190402.42+271629.8 & BM Lyr \\ 
J182240.62+293115.0 & NSV 10725 & J190725.76+354627.1 & V496 Lyr \\ 
J182529.14+313304.1 & IS Lyr    & J190827.56+384842.2 & NR Lyr \\ 
J182559.91+312952.2 & IT Lyr    & J190932.16+422013.6 & NSV 11780 \\ 
J182809.21+272403.7 & NSV 10876 & J191159.94+435725.7 & NSV 11820 \\ 
J182855.38+321513.8 & IX Lyr    & J191957.87+465320.6 & NSV 11924 \\ 
J182905.77+335457.3 & V443 Lyr  & J192219.06+441508.9 & NSV 11964 \\ 
J183044.56+382355.1 & KN Lyr    & J192544.43+510929.2 & V1119 Cyg \\ 
J183253.85+430101.5 & OP Lyr    & J192633.96+522908.9 & NSV 12055 \\ 
J183345.31+281716.4 & FR Lyr    & J193037.82+494040.5 & NSV 12114 \\ 
J183412.62+323533.4 & KZ Lyr    & J193247.37+430701.5 & V461 Cyg \\ 
J183412.88+323540.2 & KZ Lyr    & J193327.66+383202.4 & HO Cyg \\ 
J183507.95+313233.4 & V464 Lyr  & J193328.41+403035.4 & HP Cyg \\ 
J183510.04+423333.8 & NSV 11081 & J193417.93+425513.0 & V1133 Cyg \\ 
J183534.10+260357.7 & BN Her    & J193425.54+451829.5 & V1621 Cyg \\ 
J183536.41+392944.1 & LM Lyr    & J193650.52+532833.5 & DE Cyg \\ 
\hline
\end{tabular}
\end{center}
\end{table}

\begin{table}
\caption{Number of variables in the ROTSE1 survey according 
to their classification by the ROTSE1 team}
\begin{center}
\begin{tabular}{crrrr}
\hline
\multicolumn{1}{c}{ROTSE1} & \multicolumn{1}{c}{Previously} & \multicolumn{1}{c}{Identified} & \multicolumn{1}{c}{Identified} & \multicolumn{1}{c}{Percentage}\\ 
\multicolumn{1}{c}{classification} & \multicolumn{1}{c}{unknown} & \multicolumn{1}{c}{in Simbad} & \multicolumn{1}{c}{in this paper} & \multicolumn{1}{c}{new variables} \\
\hline
c & 187 & 2 & 12 & 93 \\
ds & 87 & 3 & 1 & 96 \\
e & 80 & 25 & 4 & 73 \\
ew & 350 & 29 & 3 & 92 \\
lpv & 427 & 47 & 60 & 80 \\
m & 39 & 60 & 47 & 27 \\
rrab & 76 & 71 & 39 & 41 \\
rrc & 102 & 7 & 4 & 90 \\
\hline
\end{tabular}
\end{center}
\end{table}

\IBVSetable{5134-t3.tex}

\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 
 
Diethelm, R., 2001, {\it IBVS}, No.\ 5060 
 
Kinnunen, T., Skiff, B.A., 2000a, {\it IBVS}, No.\ 4895

Kinnunen, T., Skiff, B.A., 2000b, {\it IBVS}, No.\ 4897

\endreferences

\end{document}
