\documentclass[twoside]{article}

\usepackage{ibvs2}
\usepackage{epsf}

\begin{document}

\IBVShead{5631}{22 June 2005}

\IBVStitle{Hipparcos Eclipsing Binaries Showing Apsidal Motion II.}

\IBVSauth{Otero, Sebasti\'an A.}

\IBVSinsto{Grupo Wezen 1 88; Centro de Estudios Astron\'omicos (CEA); e-mail: varsao@fullzero.com.ar}

\SIMBADobj{KL CMa}
\SIMBADobj{LT CMa}
\SIMBADobj{MN TrA}
\SIMBADobj{HD 171491}
\SIMBADobj{V397 Pup}
\SIMBADobj{V399 Pup}
\SIMBADobj{V493 Car}
\SIMBADobj{V529 Car}
\SIMBADobj{V821 Cas}
\SIMBADobj{V1081 Sco}

\IBVStyp{ EA }

\IBVSkey{variable stars, eclipsing binary, periods, apsidal motion}

\IBVSabs{Ten eclipsing binaries with eccentric orbits are found to display}
\IBVSabs{apsidal motion by combining Hipparcos, ASAS-3 and NSVS data.}


\begintext

Combination of the publicly available Hipparcos data (Perryman et al., 1997) from 1989-1993 with ASAS-3 (Pojmanski, 2002) and NSVS data (Wozniak et al., 2004) allows the detection of apsidal motion in ten eclipsing binaries discovered by the satellite.
Table 1 lists the main parameters of the stars. The first column gives the variable star designation. The following columns show the HIP identifier, the V band range (with the secondary eclipse magnitude between brackets), the epoch and period of the primary and secondary eclipse respectively, the variable and spectral types and the source for spectral type following the numbering first adopted in Otero (2003).

\begin{table}[!hb]
\centerline{\bf Table 1.}
\small
\begin{center}
\begin{tabular}{ccr@{$-$}lcccccc}
Star&HIP identif&\multicolumn{2}{c}{V magnitude} & Epoch I &  Period I&  Epoch II& Period II&  Type &  Sp\\
\hline
KL CMa	        & HIP 031017 & 6.73 & 6.96(6.92:) & 8170.261 & 1.762250 & 8171.228 & 1.762168 & EA  &  B8V (4)\\
LT CMa	        & HIP 034080 & 7.43 & 7.59(7.57:) & 8388.537 & 1.759535 & 8389.445 & 1.759503 & EA  &  B5III (4)\\
MN TrA	        & HIP 078231 & 8.49 & 9.15 (8.99) & 8006.360 & 2.379818 & 8007.426 & 2.379833 & EA  &  B9V (1)\\
NSV 24512	& HIP 091113 & 7.95 & 8.09 (8.09) & 9038.828 & 2.259775 & 9039.972 & 2.259735 & EA  &  B3V (45)\\
V0397 Pup	& HIP 038167 & 5.94 & 6.11 (6.03) & 8799.646 & 3.004449 & 8801.672 & 3.004390 & EA  &  B9V (3)\\
V0399 Pup	& HIP 038186 & 9.33 & 9.57:(9.47) & 7889.738 & 3.91023  & 7891.862 & 3.91003  & EA  &  B1Vnn (8)\\
V0493 Car	& HIP 048832 & 8.87 & 9.22 (9.13) & 7945.724 & 3.22943  & 7947.768 & 3.22937  & EA  &  B9IV (1)\\
V0529 Car	& HIP 054026 & 8.10 & 8.48 (8.36) & 8157.209 & 4.74461  & 8159.970 & 4.74449  & EA  &  B8V (1)\\
V0821 Cas	& HIP 118223 & 8.22 & 8.66 (8.46) & 7964.209 & 1.769754 & 7965.031 & 1.769720 & EA  &  A0 (24)\\
V1081 Sco	& HIP 085569 & 6.98 & 7.11 (7.05) & 7920.528 & 2.513741 & 7921.858 & 2.513664 & EA  &  O9.5V (24)\\
\hline
\end{tabular}
\end{center}
Sources of spectral type: (1) Houk and Cowley, 1975. (3) Houk, 1982. (4) Houk and Smith-Moore, 1988. (8) Kennedy, 1983. (24) Ochsenbein, 1980. (45) Skiff, 2003. 
\end{table}


Notes on individual stars:\\
~\\
KL CMa = Visual binary (HJ 3864), B= 11.0 mag. Sep. 21\farcs6 (Worley et al., 1997). The Hipparcos Catalogue gives a period of 1.7622 d. It is the one with the largest apsidal motion.\\
LT CMa = The Hipparcos Catalogue gives a period of 1.75955 d.\\
MN TrA = The Hipparcos Catalogue gives a period of 2.37983 d. This is the only case where the $O-C$ values for min II have grown positive.\\
NSV 24512 = HD 171491. Primary eclipse might be the secondary. Visual binary. A= 8\fmm8; B= 8\fmm9 Hp. Sep 0\farcs275 (Perryman et al., 1997)\\
V0397 Pup = The Hipparcos Catalogue gives a period of 3.00455 d. Few times of minima in ASAS correspond to the time period November 2003 - October 2004 when the camera focus and exposure time was changed allowing bright stars not to be saturated.\\
V0399 Pup = The Hipparcos Catalogue gives a period of 3.9102 d\\
V0493 Car = The Hipparcos Catalogue gives a period of 3.2294 d\\
V0529 Car = The Hipparcos Catalogue gives a period of 4.7445 d\\
V0821 Cas = The Hipparcos Catalogue gives a period of 1.76975 d\\

Hipparcos observations have been transformed to V using a table by the author (Otero, 2003b).
The observation regime for both surveys, specially ASAS, implies that times of minima are often based on a single datapoint so they are approximate. Only single observations closer than 0.05 magnitudes to the mideclipse magnitude and closer than 0.05 days to the phase 0 of the folded lightcurve have been used as times of minima to get a sigma in the order of 0.03 days or less depending on the quality and quantity of the observations. On the other hand, the epochs have been determined applying the method of bisected chords on the whole datasets and are very accurate due to the long time span of the observations (1989-2005). Wrong observations (random datapoints deviating $>$0.05 mag. from the mean folded lightcurve) were discarded before any analysis was made.

Table 2 shows times of minima and residuals for all the stars based on the primary eclipse period to make the phase shift of the secondary eclipse evident.

\begin{table}[!hb]
\centerline{\bf Table 2.}
\begin{center}
\begin{tabular}{crrcc}
Star   &  HJD+2440000 &  $O-C$  & Min  & Source$^*$\\
\hline
KL CMa	& 8171.256	& 0.028 	& II	&  H\\
      	& 8304.198	& 0.006 	& I	&  H\\
      	& 8532.505	& 0.016 	& II	&  H\\
      	& 8652.310	& $-$0.012	& II	&  H\\
      	& 8661.146	& 0.013 	& II	&  H\\
      	& 8698.920	& $-$0.016 	& I	&  H\\
      	& 8747.506	& 0.022 	& II	&  H\\
       	& 12197.796	& $-$0.173	& II	&  A\\
       	& 12235.747	& $-$0.025 	& I	&  A\\
       	& 12924.839	& 0.028 	& I	&  A\\
       	& 12997.823	& $-$0.208	& II	&  A\\
       	& 13043.628	& $-$0.221	& II	&  A\\
       	& 13256.857	& $-$0.225	& II	&  A\\
       	& 13294.885	& 0.001 	& I	&  A\\
       	& 13399.597	& $-$0.227	& II	&  A\\
       	& 13414.705	& $-$0.012 	& I	&  A\\
       	& 13436.603	& $-$0.228	& II	&  A\\
LT CMa	& 8323.409	& $-$0.025 	& I	&  H\\
      	& 8389.416	& $-$0.029	& II	&  H\\
      	& 8402.644	& 0.031 	& I	&  H\\
      	& 8590.861	& $-$0.023 	& I	&  H\\
       	& 11980.586	& $-$0.070	& II	&  A\\
       	& 12250.740	& 0.024 	& I	&  A\\
       	& 12623.723	& $-$0.015 	& I	&  A\\
       	& 12645.688	& $-$0.072	& II	&  A\\
       	& 12727.562	& 0.012 	& I	&  A\\
       	& 13018.677	& $-$0.105	& II	&  A\\
       	& 13115.503	& $-$0.053	& II	&  A\\
       	& 13251.900	& 0.008 	& I	&  A\\
       	& 13362.719	& $-$0.023 	& I	&  A\\
       	& 13444.538	& $-$0.051	& II	&  A\\
       	& 13466.550	& $-$0.005 	& I	&  A\\
\hline
\end{tabular}
\end{center}          
$^*$H = Hipparcos; A = ASAS-3; N = NSVS
\end{table}


\begin{table}[!hb]
\centerline{\bf Table 2. (cont.)}
\begin{center}
\begin{tabular}{crrcc}
Star   &  HJD+2440000 &  $O-C$  & Min  & Source$^*$\\
\hline
MN TrA	& 8006.362	& 0.002 	& I	&  H\\
      	& 8566.687	& 0.004 	& II	&  H\\
      	& 8568.021	& 0.024 	& I	&  H\\
	& 8680.933	& 0.019 	& II	&  H\\
       	& 11950.811	& 0.027 	& II	&  A\\
       	& 12437.605	& 0.024 	& I	&  A\\
       	& 12790.893	& 0.033 	& II	&  A\\
       	& 12826.585	& 0.028 	& II	&  A\\
       	& 12839.748	& $-$0.022 	& I	&  A\\
       	& 13059.824	& 0.044 	& II	&  A\\
       	& 13391.866	& $-$0.022 	& I	&  A\\
       	& 13454.849	& 0.020 	& II	&  A\\
NSV 24512&8168.808	& $-$0.007 	& I	&  H\\
         &9038.822	& $-$0.006 	& I	&  H\\
       	& 11996.852	& $-$0.021 	& I	&  A\\
       	& 12030.811	& 0.041 	& I	&  A\\
	& 12701.902	& $-$0.021 	& I	&  A\\
       	& 12736.870	& $-$0.094	& II	&  A\\
       	& 12804.694	& $-$0.063	& II	&  A\\
       	& 13092.868	& 0.004 	& I	&  A\\
       	& 13127.811	& $-$0.094	& II	&  A\\
       	& 13290.521	& $-$0.088	& II	&  A\\
       	& 13298.522	& 0.018 	& I	&  A\\
       	& 13492.864	& 0.019 	& I	&  A\\
V0397 Pup&7979.456	& 0.008 	& I	&  H\\
      	& 8655.450	& 0.015 	& I	&  H\\
      	& 8697.493	& $-$0.004 	& I	&  H\\
      	& 8801.699	& 0.027	        & II	&  H\\
	& 12971.749	& $-$0.098	& II	&  A\\
       	& 12974.781	& $-$0.071	& II	&  A\\
       	& 12980.773	& $-$0.088	& II	&  A\\
V0399 Pup&7891.838	& $-$0.024	& II	&  H\\
      	& 8116.550	& 0.019 	& I	&  H\\
      	& 8153.949	& 0.102	        & II	&  H\\
      	& 8550.550	& $-$0.017 	& I	&  H\\
      	& 8976.765	& $-$0.017 	& I	&  H\\
       	& 11948.581	& 0.024 	& I	&  A\\
       	& 12239.767	& $-$0.271	& II	&  A\\
       	& 12720.718	& $-$0.278	& II	&  A\\
       	& 12724.630	& $-$0.276	& II	&  A\\
       	& 12730.616	& 0.013 	& I	&  A\\
       	& 12884.896	& $-$0.330	& II	&  A\\
       	& 13469.625	& $-$0.011 	& I	&  A\\
       	& 13520.473	& 0.004 	& I	&  A\\
V0493 Car&7947.738	& $-$0.030	& II	&  H\\
        & 7971.541	& $-$0.018 	& I	&  H\\
      	& 8067.253	& $-$0.004	& II	&  H\\
      	& 8210.531	& $-$0.006 	& I	&  H\\
	& 8288.026	& $-$0.018 	& I	&  H\\
      	& 8629.140	& $-$0.038	& II	&  H\\
      	& 8992.019	& $-$0.040 	& I	&  H\\
       	& 11903.721	& $-$0.099	& II	&  A\\
       	& 11958.656	& $-$0.064	& II	&  A\\
\hline
\end{tabular}
\end{center}          
$^*$H = Hipparcos; A = ASAS-3; N = NSVS
\end{table}


\begin{table}[!ht]
\centerline{\bf Table 2. (cont.)}
\begin{center}
\begin{tabular}{crrcc}
Star   &  HJD+2440000 &  $O-C$  & Min  & Source$^*$\\
\hline
       	& 12198.869	& $-$0.014 	& I	&  A\\
       	& 12255.764	& $-$0.064	& II	&  A\\
      	& 12552.864	& $-$0.071	& II	&  A\\
       	& 12647.766	& $-$0.008 	& I	&  A\\
      	& 12649.750	& $-$0.068	& II	&  A\\
       	& 12854.469	& 0.011 	& I	&  A\\
       	& 12946.819	& $-$0.107	& II	&  A\\
       	& 12957.832	& 0.033 	& I	&  A\\
       	& 13382.792	& $-$0.107	& II	&  A\\
       	& 13450.638	& $-$0.079	& II	&  A\\
       	& 13474.513	& 0.005 	& I	&  A\\
V0529 Car&8159.997	& 0.027 	& II	&  H\\
      	& 8261.618	& 0.028 	& I	&  H\\
        & 9015.943	& $-$0.040 	& I	&  H\\
       	& 11938.694	& 0.031 	& I	&  A\\
       	& 12752.655	& $-$0.097	& II	&  A\\
       	& 12754.752	& 0.016 	& I	&  A\\
       	& 12809.545	& $-$0.143	& II	&  A\\
       	& 13008.784	& $-$0.177	& II	&  A\\
       	& 13167.536	& 0.019 	& I	&  A\\
       	& 13385.781	& 0.012 	& I	&  A\\
       	& 13454.799	& $-$0.156	& II	&  A\\
       	& 13480.686	& 0.025 	& I	&  A\\
V0821 Cas&8224.368	& 0.005 	& I	&  H\\
      	& 8357.091	& $-$0.003 	& I	&  H\\
      	& 8363.224	& $-$0.002	& II	&  H\\
      	& 8561.413	& $-$0.025	& II	&  H\\
      	& 8777.324	& $-$0.024	& II	&  H\\
        & 9040.219	& 0.000 	& I	&  H\\
       	& 11417.694	& $-$0.127	& II	&  N\\
       	& 11450.603	& $-$0.021 	& I	&  N\\
       	& 11479.637	& $-$0.125	& II	&  N\\
V1081 Sco&8184.452	& $-$0.019 	& I	&  H\\
      	& 8838.078	& 0.035 	& I	&  H\\
       	& 11963.858	& $-$0.096	& II	&  A\\
       	& 12432.681	& $-$0.012 	& I	&  A\\
       	& 12466.594	& $-$0.108	& II	&  A\\
       	& 13504.728	& $-$0.149	& II	&  A\\
\hline
\end{tabular}
\end{center}          
$^*$H = Hipparcos; A = ASAS-3; N = NSVS
\end{table}

\IBVS2fig{7cm}{5631-f1.eps}{Light curve of KL CMa showing Hipparcos and ASAS-3 observations.}{5631-f2.eps}{Light curve of LT CMa showing Hipparcos and ASAS-3 observations.}
\IBVSfigKey{5631-f1.eps}{KL CMa}{light curve}
\IBVSfigKey{5631-f2.eps}{LT CMa}{light curve}

\IBVS2fig{7cm}{5631-f3.eps}{Light curve of MN TrA showing Hipparcos and ASAS-3 observations.}{5631-f4.eps}{Light curve of NSV 24512 showing Hipparcos and ASAS-3 observations.}
\IBVSfigKey{5631-f3.eps}{MN TrA}{light curve}
\IBVSfigKey{5631-f4.eps}{NSV 24512}{light curve}

\IBVS2fig{7cm}{5631-f5.eps}{Light curve of V397 Pup showing Hipparcos and ASAS-3 observations.}{5631-f6.eps}{Light curve of V0399 Pup showing Hipparcos and ASAS-3 observations.}
\IBVSfigKey{5631-f5.eps}{V397 Pup}{light curve}
\IBVSfigKey{5631-f6.eps}{V399 Pup}{light curve}

\IBVS2fig{7cm}{5631-f7.eps}{Light curve of V493 Car showing Hipparcos and ASAS-3 observations.}{5631-f8.eps}{Light curve of V529 Car showing Hipparcos and ASAS-3 observations.}
\IBVSfigKey{5631-f7.eps}{V493 Car}{light curve}
\IBVSfigKey{5631-f8.eps}{V529 Car}{light curve}

\IBVSfig{5.3cm}{5631-f9.eps}{Light curve of V821 Cas showing Hipparcos and NSVS observations.}
\IBVSfigKey{5631-f9.eps}{V821 Cas}{light curve}

\bigskip

{\it Acknowledgements:} This research has made use of the SIMBAD and VizieR databases operated at the Centre de Donn\'ees Astronomiques (Strasbourg) in France.


\newpage


\references

Houk, N., Cowley, A.P., 1975, Dept. of Astronomy, Univ. of Michigan Ann Arbor, {\it Catalogue of two dimensional spectral types for the HD stars}, {\bf Vol. 1}
\ADSBIBCODE{1975MSS...C01....0H}

Houk, N., 1982, Dept. of Astronomy, Univ. of Michigan Ann Arbor, {\it Catalogue
of two-dimensional spectral types for the HD stars, Vol. 3 }
\ADSBIBCODE{1982MSS...C03....0H}

Houk, N., Smith-Moore, M., 1988, Dept. of Astronomy, Univ. of Michigan Ann Arbor, {\it Catalogue of two-dimensional spectral types for the HD stars}, {\bf Vol. 4}
\ADSBIBCODE{1988MSS...C04....0H}

Kennedy, P.M., 1983, Mt Stromlo \& Siding Spring Observatories, Australia, {\it MK Classification Catalogue Extension }

Ochsenbein, F., 1980, {\it Bull. Inf. CDS}, {\bf 19}, 74
%%(1980BICDS..19...74O)

Otero, S., 2003, {\it IBVS}, No. 5480 

Otero, S., 2003b, {\it IBVS} No. 5482 ({\tt http://www.konkoly.hu/pub/ibvs/5401/5482-t2.txt})

Perryman, M.A.C., et al., 1997, {\it A\&A}, {\bf 323}, 49, The Hipparcos Catalogue
%%(1997A&A...323L..49P)

Pojmanski, G., 2002, {\it Acta Astronomica}, {\bf 52}, 397, The All Sky Automated Survey
%%(2002AcA....52..397P)

Skiff, B.A., 2003, Lowell Observatory, {\it General Catalogue of Stellar Spectral Classifications}
\ADSBIBCODE{2003yCat.3233....0S}

Worley, C.E., Douglass, G.G., 1997, {\it A\&AS}, {\bf 125}, 523, The Washington Visual Double Star Catalog, 1996.0
%%(1997A&AS..125..523W)

Wozniak, P.R., et al., 2004, {\it AJ}, {\bf 127}, 2436, Northern Sky Variability Survey: Public Data Release
%%(2004AJ....127.2436W)

\endreferences

\end{document}
