\documentstyle[twoside, ibvs2, epsf]{article}

\input ibvst.sty
\input ibvse.sty
\input epsf.sty

\begin{document}

\IBVShead{5570}{14 October 2004}

\IBVStitle{New Eclipsing Binaries Found in the NSVS Database I.}

\IBVSauth{Otero, Sebasti\'an A.$^{1,2}$; Wils, Patrick$^3$; Dubovsky, Pavol A.$^4$}

\IBVSinst{Grupo Wezen 1 88, Buenos Aires, Argentina; e-mail: varsao@fullzero.com.ar}
\IBVSinst{Centro de Estudios Astron\'omicos (CEA), Mar del Plata, Argentina}
\IBVSinst{Vereniging Voor Sterrenkunde, Belgium; e-mail: patrick.wils@cronos.be}
\IBVSinst{Slovak Association of Amateur Astronomers, Podbiel, Slovakia; e-mail: vkco@isternet.sk}

\IBVStyp{ EA, EB, EW }

\IBVSkey{variable stars, eclipsing binary, periods}

\IBVSabs{This research presents the discovery of 100 new eclipsing binaries}
\IBVSabs{found in the NSVS database.}


\begintext

The variability of the stars listed in this study was found in the public data 
release from the Northern Sky Variablity Survey (NSVS; Wozniak et al., 2004). 
Using the SQL interface available from the Skydot website 
({\tt http://skydot.lanl.gov/nsvs/nsvs.php}), stars were selected on the 
basis of a number of statistical criteria. The stars needed to have at least 
100 data points, and a significantly larger standard deviation compared to 
the average value for their magnitude. It was also required that the mean of 
squared successive magnitude differences for a star was larger than about 
30\% of the standard deviation, thus excluding long period variables. 
Finally, the skewness calculated from a star's magnitudes had to be positive, 
favouring stars spending more time at maximum than at minimum. Standard 
flagged data and data with the APINCOMPL mask set (Wozniak et al., 2004) 
were not taken into account during these calculations. Because of obvious 
limitations of the available data, this study does not claim to give an 
exhaustive list of eclipsing binaries in the areas searched. Most of the stars 
in the current paper were in fact found during a search for Cepheids along the 
Northern Milky Way (Wils and Greaves, 2004).

ASAS-3 (Pojmanski, 2002) and NSVS data have been combined to prepare this 
first list with elements for 100 new eclipsing binaries.

The method of bisected chords was used to determine times of minima. The 
accuracy depends on the quantity and quality of the observations. Elements 
were found with AVE (Barber\'a, 1999) and a Microsoft Excel period search 
utility.

Unfiltered NSVS ROTSE1 magnitudes were shifted to match the ASAS-3 V magnitude 
of the stars. In all cases but one (GSC 4835 1947) the amplitude of the 
eclipses were the same for both datasets so the combination was successful. For 
stars North of +28 degrees, where no ASAS observations exist, the original 
ROTSE1 magnitudes are given.

Table 1 shows the list of variables. The first column gives the GSC 
designation. The following columns give another identifier; the brightness 
range of the variable (V\,=\,\hbox{ASAS-3~V} magnitudes; *= ROTSE1 magnitudes), with the 
magnitude of secondary eclipse between brackets; the epoch of minimum light 
derived from all the data available; the period; the variability class and the 
spectral type with a note to the spectral type source.
      
\newpage

\begin{table}[!h]
\small
\begin{center}
\begin{tabular}{llc@{$-$}ccccc}
\hline
\multicolumn{2}{c}{Star Name} & \multicolumn{2}{c}{Magnitude range}  &     Epoch   &   Period & Type&     Spectral type\\
 GSC ID  &  Other ID  &       \multicolumn{2}{c}{}           &     (HJD2440000+)& (days)  & &\\
\hline
0140 0964 & AC 0043437 & 11.92 & 12.8 (12.65)V &  11525.891 &  0.298305  & EW/KW&\\
0140 1869 & AC 0042265 & 12.89 & 13.6  (13.6)V &  11508.815 &  1.45065   & EA&\\
0143 0226*& HD 252984  & 10.13 & 10.73(10.63)V &  12946.750 &  4.21618   & EA &      A0 (33)\\
0145 2357 & AC 0257934 & 12.28 & 12.83(12.80)V &  11498.710 & 10.0209    & EA&\\
0155 1091 & HD 261744  & 10.89 & 11.41(11.39)V &  12714.509 &  2.95379   & EA      & F8 (33)\\
0155 2294 & HD 261717  & 10.35 & 10.67(10.63)V &  11566.624 &  1.85270   & EA     &  A0V (51)\\
0158 0541 & HD 260764  & 10.62 & 11.15:(10.82)V &  11604.760&   3.06895   & EA   &    A2 (33)\\
0159 0812 & HD 261685  & 11.27 & 11.72(11.44)V &  12521.868 &  2.88420   & EA   &    A (33)     \\
0159 1018 & HD 261449  & 10.31 & 10.59(10.57)V &  11549.733 &  1.41626   & EA  &     F8 (33)\\
0160 1934 & HD 264769  & 10.85 & 11.17(11.15)V &  11465.840 &  2.13583   & EA &      B (33)\\
0170 1717*& AC 0063381 & 10.90 & 11.17(11.16)V &  11522.719 &  0.361883  & EW&\\
0410 2795 & AC 0345491 & 10.89 & 11.49(11.12)V &  12775.769 &  0.490383  & EB	&\\
0437 0438 & AC 0151782 & 12.54 & 13.37(13.32)V &  12760.797 &  2.14220   & EA&\\
0441 0916 & AC 0151695 & 12.75 & 14.0 (12.77:)V &  11450.710 &  3.3749   & EA&\\
0448 0415*&            & 12.41 &  13.2 (13.2)V &  12725.340 & 99.4022    & EA  &   \\
0469 0914 &            & 12.45 & 12.95 (12.8)V &  12196.500 & 72.35      & EB &    \\
0471 0860*& AC 0157271 & 10.87 & 11.28(11.23)V &  11320.786 &  0.345897  & EW&\\
0473 3466 & AC 0160195 & 11.93 & 12.6:(12.5:)V &  12853.755 &  2.1085    & EA&\\
0485 0658 &            & 13.15 &  13.7 (13.7)V &  11420.616 &  0.290570  & EW/KW & \\
0493 0801 & BD+6 4353  & 10.42 & 11.30(10.62)V &  12524.606 &  0.986783  & EA	&\\
0613 1099 & AC 0208368 & 11.35 & 12.00(11.95)V &  12873.909 &  0.336338  & EW&\\
0646 0946 & BD+13 453  & 10.28 & 10.55(10.54)V &  11382.902 &  0.282336  & EW/KW&\\
0684 1316*& SAO 112139 & 10.32 & 10.55(10.53)V &  11594.630 &  0.377198  & EW/KW&    K0 (24)\\
0714 0096 & BD+9 932   & 10.40 & 10.84(10.62)V &  12751.489 &  0.498858  & EB  &     F0 (33)\\
0723 0980 & HD 247317  &  9.97 & 10.42(10.31)V &  11567.838 &  1.78018   & EA &      F2 (33)\\
0724 0973 & AC 0479701 & 12.10 & 12.77(12.35)V &  11504.970 &  9.7857    & EA&\\
0748 0686*& HD 267307  & 10.87 & 11.50(11.38)V &  12714.524 &  2.087092  & EA &      A5,A2 (53)\\
0748 2137 & AC 0269265 & 11.56 & 12.63 (11.7)V &  12995.698 &  1.62398   & EA&\\
0748 2423 & HD 266430  &  9.63 &  9.97 (9.93)V &  12761.545 &  4.00951   & EA    &   A0 (33)\\
1040 0399 & HD 178215  & 10.34 & 11.00(10.48)V &  11332.759 &  1.27428   & EA   &    A0 (33)\\
1042 2191 & HD 182314  &  9.14 &  9.49 (9.45)V &  12812.702 &  0.423796  & EW: &     F5 (24)\\
1045 0882 & HD 180244  & 10.34 & 10.92(10.8:)V &  11475.666 &  6.8855    & EA &      A2 (33)\\
1045 1028 & AC 0386762 & 11.46 & 12.2:(12.10)V &  12403.733 &  0.3348417 & EW&\\
1077 0828 & HD 192169  &  8.78 &  9.34 (9.30)V &  12879.640 &  1.705523  & EA      & F8 (24)\\
1113 0877 & BD+12 4581 &  9.15 &  9.35 (9.28)V &  12816.827 &  0.486707  & EB     &  F0 (28)\\
1294 1710*& HD 285166  & 10.86 & 11.48(11.37)V &  12645.558 & 12.8075    & EA    &   F8 (9)\\
1305 1430 & AC 0654855 & 10.90 & 11.20(11.20)V &  11467.823 &  0.2955252 & EW/KW&\\
1318 0042 & ALS 25     & 11.12 & 11.48 (11.4)V &  12970.180 & 13.6435    & EB     &  OBe (34)(25)\\
1322 0294 & AC 0672161 & 11.03 & 11.65(11.64)V &  11521.695 &  0.287842  & EW/KW &\\
1335 1907*& HD 265879  & 10.77 & 11.20(11.06)V &  11548.730 &  3.47041   & EA   &    A5 (33)\\
1577 0974*& HD 348698  & 11.45 & 12.05(12.01)V &  11442.689 &  7.14615   & EA  &     G0 (9)\\
1578 0728 & HD 348901  & 10.60 & 10.92(10.98)V &  11403.882 &  4.59618   & EA &      F2 (9)\\
1582 0100 & AC 0765199 & 11.46 & 12.16(11.84)V &  12747.884 &  5.5598    & EA&\\
1588 0632*&            & 12.80 & 13.84:(13.53:)V &  11362.705&  1.41924   & EA &  \\
1588 1802 &            & 12.38 & 13.08(12.68)V &  13130.770 &  7.6706    & EA:&\\
1594 1043 & HD 349787  & 10.84 & 11.27(11.22)V &  12724.899 &  2.11434   & EA     &  G0 (9)\\
1619 0051 & HD 350416  & 10.46 & 10.76(10.65)V &  11414.728 &  2.30593   & EB    &   B8 (9)\\
1620 0599*& HD 354081  & 10.03 & 10.32(10.22)V &  11454.669 &  1.37599   & EB   &    F2 (9)\\
1624 0493*& HD 350731  &  9.53 &  9.97 (9.93)V &  12830.816 &  1.63514   & EA  &     B9 (9)\\
1639 1340*& HD 352143  & 10.48 & 10.77(10.71)V &  11322.917 &  0.911325  & EW:&      F2 (9)\\
1641 1245 & AC 0808903 & 11.89 & 12.75(12.35)V &  12879.688 &  7.2432    & EA&\\
1643 1880 & AC 0803127 & 12.44 & 13.0:(12.6:)V &  11332.770 &  0.73574   & EA&\\
1761 1934 & AC 0870736 & 10.38 & 11.02(10.98)V &  11525.671 &  0.299376  & EW/KW&\\
1836 0131*&            & 12.60 & 14.5:(13.1:)V &  11531.669 &  6.9098    & EA&\\
1913 1513 & AC 0926226 & 10.93 & 11.33(11.07)V &  11515.678 &  0.491507  & EB/KW&\\
2157 0387*& HD 346723  & 10.39 & 11.03(10.60)V &  11467.654 &  1.551913  & EB:  &    A0 (9)\\
2385 0341 & HD 279999  & 10.11 & 10.75(10.7:)* &  11603.766 &  0.990715  & EA  &     F0 (9)\\
2407 0767 & HD 244128  & 10.75 & 11.07(10.85:)* &  11514.840&   1.6192    & EA&       B5 (33)\\
\hline
\end{tabular}
\end{center}
\end{table}

\begin{table}[!h]
\small
\begin{center}
\begin{tabular}{llc@{$-$}ccccc}
\hline
\multicolumn{2}{c}{Star Name} & \multicolumn{2}{c}{Magnitude range}  &     Epoch   &   Period & Type&     Spectral type\\
 GSC ID  &  Other ID  & \multicolumn{2}{c}{}          &     (HJD2440000+)& (days)  & &\\
\hline
2409 0101 & AC 0897066 & 12.95 & 13.9:(13.25)* &  11537.633 &  0.99282   & EA&\\
2685 1186 & HD 332325  & 11.37 & 11.93(11.92)* &  11358.748 &  0.62279   & EW &      F5 (9)\\
2695 1848 & AC 1265359 & 12.21 & 12.81(12.76)* &  11325.791 &  0.93536   & EA&\\
2704 1999*& BD+30 4459 & 10.70 & 11.00(10.92)* &  11341.764 &  0.610855  & EB&\\
2711 0645*& AC 1270603 & 12.20 & 12.61(12.59)* &  11537.610 &  0.506738  & EW &\\
2846 0404*& AC 1301247 & 10.71 & 11.04(11.01)* &  11494.882 &  0.387374  & EW/KW&    K0IV (50)\\
2863 0755 & HD 275743  & 10.55 & 10.82(10.70)* &  11613.738 &  3.2554    & EA  &     G5 (9)   \\
2933 1972 & AC 1448061 & 12.90 & 13.65(13.65)* &  11274.691 &  0.50488   & EA &\\
3171 0761*&            & 11.92 & 12.62(12.31)* &  11371.150 & 39.6       & EB/GS:&\\
3181 0654*& ALS 11810  & 10.56 & 11.1:(11.1:)* &  11338.750 & 47.615     & EA      & OB (43)\\
3252 0981*& BD+47 116  &  9.89 & 10.10 (10.05)* &  11542.625&  20.30      & EB/GS:&\\
3314 0544*& BD+47 768  & 10.73 & 11.25(11.21)* &  11466.660 & 12.807     & EA&\\
3319 0399 &            & 12.00 & 12.55(12.05)* &  11612.520 & 24.146     & EA&\\
3429 0424*& AC 1604650 & 11.00 & 11.80(11.70)* &  11563.948 &  0.473522  & EW&\\
3493 1324*& AC 1618923 & 11.10 & 11.45:(11.45:)* &  11277.840&   7.654     & EA&\\
3574 1420*& BD+44 3531 & 10.28 & 10.48(10.44)* &  11421.720 & 22.425     & EB/GS:&\\
3581 1856 & AC 1647164 & 10.87 & 11.27(11.21)* &  11448.682 &  0.2785137 & EW/KW   & G5-8V (41)\\
3626 0107*& AC 1680379 & 10.40 & 10.7:(10.6:)* &  11401.100 & 19.9615    & EA/GS: &\\
3633 2139*& AC 1677493 & 10.30 & 10.83:(10.69:)* &  11441.210&  17.915     & EA/GS:&\\
3708 1325*& BD+56 704  & 10.92 & 11.5:(11.38)* &  11421.719 &  3.0240    & EA    &   OB (43)   \\
3712 1820 & Lanning 54 & 11.15 & 11.49(11.47)* &  11421.708 &  0.960968  & EW/KE&    B5(V) (18)\\
3900 0615*& HD 238692  & 10.39 & 11.09(10.70)* &  11403.845 &  0.533529  & EB &      F3IV (49)\\
3950 0275 & AC 1647107 & 10.75 & 11.00(10.98)* &  11461.908 &  0.242324  & EW&\\
4021 0238*& ALS 6464   & 11.30 & 11.80(11.73)* &  11349.919 &  0.457606  & EW/KE:  & B2 (28)\\
4276 0398*& ALS 12480  & 10.76 & 10.98(10.87)* &  11364.751 &  3.8053    & EA      & OBe (25)\\
4280 1816*& ALS 13003  & 11.20 & 11.48(11.48)* &  11462.625 &  1.94145   & EA/KE  &  OB (43)\\
4286 0049*& BD+64 1740 & 10.62 & 10.92(10.86)* &  11295.837 &  1.85197   & EA &    \\
4296 0222 & BD+67 97   &  9.95 & 10.15(10.14)* &  11608.823 & 13.651     & EA&\\
4297 1664*&            & 11.85 & 12.39(12.28)* &  11473.568 &  4.159     & EA&\\
4338 0429 & BD+72 167  &  9.78 & 10.25(10.22:)* &  11602.607&   3.4572    & EA&\\
4339 0250*&            & 12.45 & 13.01(13.01)* &  11421.782 &  0.84040   & EA&\\
4420 1984 & AC 2045693 & 11.55 & 12.15 (12.12)* &  11356.754&   0.61927   & EW&  \\
4421 1217 & AC 2047724 & 12.11 & 12.89(12.75)* &  11318.723 &  0.3472223 & EW&\\
4436 1300*& AC 2053572 & 11.77 & 12.12(12.07)* &  11338.851 &  0.457033  & EB/KE&\\
4527 0161 & AC 1991853 & 10.94 & 11.22(11.21)* &  11525.793 &  0.619753  & EA/RS:&\\
4614 1442*& AC 2102233 & 11.08 & 12.00(11.34)* &  11356.739 &  1.54912   & EA/RS&\\
4650 1055*& AC 2093265 & 11.78 & 12.28(12.23)* &  12856.842 &  0.328692  & EW&\\
4822 2853*& HD 052433  &  8.30 &  8.55 (8.52)V &  12625.800 &  5.95575   & EA    &   B9 (24)\\
4835 1947*& BD$-$2 2221  &  9.05:&  9.70:(9.48:)V &  13057.664&   0.637705  & EB   &    A5 (28)\\
4854 0362*& HD 067093  &  8.84 &  9.18 (9.18)V &  11927.725 &  4.33593   & EA&       A3/5mA7-F0 (5)\\
4902 1190*& BD$-$4 2739  &  9.96 & 10.50(10.46)V &  12705.725 &  1.43916   & EA&\\
5146 0728*& PPM 708078 & 10.16 & 10.33(10.30)V &  12437.759 &  0.523673  & EB/KE:&\\
\hline
\end{tabular}
\end{center}
Sources of spectral type: (5) Houk and Swift, 1999. (9) Nesterov et al., 1995. (17) Buscombe, 1998. (18) Buscombe, 1999. (24) Ochsenbein, 1980. (25) Wackerling, 1970. (28) Kharchenko, 2001. (33) Cannon and Pickering, 1993. (34) Stephenson and Sanduleak, 1971. (41) Motch et al., 1997. (43) Hardorp et al., 1959-1965. (49) Bartaya, 1983. (50) Li and Hu, 1998. (51) Voroshilov et al., 1985. (53) Schmidt and Carruthers, 1993.
\end{table}

\IBVSetable{5570-t1.tex}
\IBVSecomment{The table with light curve links}

Notes on individual stars:\\
\\
GSC 0143 0226 = Eccentric system. Visual companion (9.8 Vt; sp. K5)(Wright et al., 2003) at 5\farcs0 (Worley and Douglass, 1997)\\
GSC 0170 1717 = Slight O'Connell effect.\\
GSC 0448 0415 = Primary eclipse might be the secondary.\\
GSC 0471 0860 = Slight O'Connell effect.\\
GSC 0684 1316 = Changing O'Connell effect.\\
GSC 0748 0686 = Spectrum is for a blend (Schmidt and Carruthers, 1993). Spectrum G5 in Cannon and Pickering (1993) is not consistent with 2MASS and Tycho-2 colors.\\
GSC 1294 1710 = Eccentric system. \\
GSC 1335 1907 = Eccentric system.\\
GSC 1577 0974 = Eccentric system.\\
GSC 1588 0632 = Slightly eccentric.\\
GSC 1620 0599 = Visual binary. $A=10\fmm7$; $B=10\fmm9$ Vt. Sep. 0\farcs57 (Fabricius et al., 2002).\\
GSC 1624 0493 = Eccentric system.\\
GSC 1639 1340 = Might be EB-type.\\
GSC 1836 0131 = Slightly eccentric system.\\
GSC 2157 0387 = Might be EA-type.\\
GSC 2704 1999 = O'Connell effect.\\
GSC 2711 0645 = O'Connell effect.\\
GSC 2846 0404 = Very strong O'Connell effect. Max II= 10.82. Possible T Tauri star (Li and Hu, 1998).\\
GSC 3171 0761 = H-alpha star (Kohoutek et al., 1997) and infrared source (Egan et al., 2003).\\
GSC 3181 0654 = Eccentric system. Primary eclipse might be the secondary.\\
GSC 3252 0981 = Visual binary. $A=10.\fmm7$; $B=11\fmm2$ Vt. Sep. 0\farcs66 (Fabricius et al., 2002). Tycho-2 $B-V$ for the combined light is 1\fmm08 (Hog et al., 2000).\\
GSC 3314 0544 = Eccentric system.\\
GSC 3429 0424 = Slight O'Connell effect.\\
GSC 3493 1324 = Slightly eccentric system.\\
GSC 3574 1420 = $B-V$ from Tycho-2= 0\fmm98.\\
GSC 3626 0107 = $B-V$ from Tycho-2= 1\fmm26.\\
GSC 3633 2139 = $B-V$ from Tycho-2= 1\fmm42.\\
GSC 3708 1325 = Eccentric system.\\
GSC 3900 0615 = O'Connell effect. Max. II= 10.43.\\
GSC 4021 0238 = Might be EB/KE.\\
GSC 4276 0398 = Also possibly BE or WR-type.\\
GSC 4280 1816 = Primary eclipse might be the secondary.\\
GSC 4286 0049 = Eccentric system.\\
GSC 4297 1664 = Slightly eccentric system.\\
GSC 4339 0250 = Primary eclipse might be the secondary.\\
GSC 4436 1300 = O'Connell effect.\\
GSC 4614 1442 = RS period = orbital period.\\
GSC 4650 1055 = Slight O'Connell effect. Max. II= 11.81.\\
GSC 4822 2853 = Eccentric system.\\
GSC 4835 1947 = Data contaminated by nearby GSC 4835 2059. ASAS-3 data used is that of the smaller aperture reduction. NSVS amplitude reduced by the light contamination.\\
GSC 4854 0362 = Wils and Dvorak (2003) give a period of 2.16780 d. and suggest the real period might be double.\\
GSC 4902 1190 = Wils and Dvorak (2003) give a period of 0.71958 d. and suggest the real period might be double.\\
GSC 5146 0728 = Might be EW/KE.\\


\IBVSfig{10cm}{5570-f1.eps}{Light curve of GSC 0143 0226 showing NSVS and ASAS-3 observations.}
\IBVSfigKey{5570-f1.eps}{GSC 0143-0226}{light curve}

\IBVSfig{10cm}{5570-f2.eps}{Light curve of GSC 0684 1316 showing NSVS and ASAS-3 observations.}
\IBVSfigKey{5570-f2.eps}{GSC 0684-1316}{light curve}

\IBVSfig{10cm}{5570-f3.eps}{Light curve of GSC 0714 0096 showing NSVS and ASAS-3 observations.}
\IBVSfigKey{5570-f3.eps}{GSC 0714-0096}{light curve}

\IBVSfig{10cm}{5570-f4.eps}{Light curve of GSC 2846 0404 showing NSVS observations.}
\IBVSfigKey{5570-f4.eps}{GSC 2846-0404}{light curve}

\IBVSfig{10cm}{5570-f5.eps}{Light curve of GSC 4614 1442 showing NSVS observations.}
\IBVSfigKey{5570-f5.eps}{GSC 4614-1442}{light curve}


{\it Acknowledgements:} The authors want to thank Doug Welch for providing access to the NSVS database at McMaster University and John Greaves for his collaboration and suggestions. This research has made use of the SIMBAD and VizieR databases operated at the Centre de Donn‰es Astronomiques (Strasbourg) in France.


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\endreferences

\strut
\bigskip

%From IBVS 5608

\IBVSerratum{5570}

In the list of new eclipsers GSC 1294-1710 should be GSC 1294-0710.
\bigskip

S. Otero


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