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\input ibvs2.sty
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\IBVShead{5153}{9 August 2001}

\IBVStitle{First Photometric Observations of MR Delphini}

\IBVSauth{Soydugan, F.$^{1}$; Budding, E.$^{1}$; Dem\.{i}rcan, O.$^{1}$; Erdem, A.$^{1}$; \c{C}\.{i}\c{c}ek, C.$^{1}$; \\ \indent \"Ozdem\.{i}r, S.$^{1}$; Bulut, \.{I}.$^{1}$; Soydugan, E.$^{1}$; De\u{g}\.{i}rmenc\.{i}, \"{O}.L.$^{2}$; Bozkurt, Z.$^{2}$; \\ \indent Yakut, K.$^{2}$; Eseno\u{g}lu, H.$^{3}$;  Heged\"{u}s, T.$^{4}$; Borkovits, T.$^{4}$; B\'{i}r\'{o}, I.B.$^{4}$}

\IBVSinst{\c{C}anakkale Onsekiz Mart University, Faculty of Arts and
Sciences, Department of Physics,\\ \indent TR-17100 \c{C}anakkale,
Turkey, sfaruk@astronomy.sci.ege.edu.tr, demircan@comu.edu.tr} %email


\IBVSinst{Ege University, Science Faculty, Department of Astronomy and
Space Sciences, TR-35100 Bornova, \\ \indent Izmir, Turkey}

\IBVSinst{\.{I}stanbul University, Science Faculty, Deparment of
Astronomy and Space Sciences, TR-34452 \.{I}stanbul, \\ \indent Turkey
}

\IBVSinst{Baja Astronomical Observatory of B\'{a}cs-Kiskun County,
Baja, Szegedi \'{u}t, P.O. Box 766, H-6500, Hungary}

\SIMBADobjAlias{MR Del}{HD 195434}

\begintext

\IBVSTnam{MR Del = BD +04\deg4470 = HIP 101236 = HD 195434}

\IBVSTcoo{20\hr31\mm13\fsec29}{+05\deg13\arcm06\farcs1}{2000}

\IBVSTobs{\vrule height12.5pt width0pt T\"{U}B\.{I}TAK (Scientific and
Technical Research Council of Turkey) National Observatory, 40-cm
Cassegrain telescope}

\IBVSTdet{Hamamatsu, R 4457 (PMT)}

\IBVSTfil{Johnson $B$, $V$ and $R$}

\IBVSTcomp{BD +04\deg4463 = HD 195235}

\IBVSTchk{BD +04\deg4476 = PPM 170209}

\IBVSTsysn

\IBVSTdata{Upon request}

\IBVSTtyp{ EA }

\newpage

\IBVSfig{12.2cm}{5153-f1.ps}{Light and color curves of MR Del}

\IBVSTrem{
The relatively bright EA type eclipsing binary MR Del was discovered by
HIPPARCOS (ESA, 1997). The photometric observations of the system by
HIPPARCOS show an Algol type light curve. The variation range of this
light curve is between from 8\fmm87 to 9\fmm13. (Note an apparent
misidentification on this values in the SIMBAD database.) The mean
orbital period derived by HIPPARCOS from the light curve fit is
0\fday52169 and the epoch is given as JD 2448500.5160 (ESA, 1997).
Spectral type of the system is given as K0. MR Del was observed on 10,
13, 15, 16 and 18 July 2000 at the T\"{U}B\.{I}TAK National
Observatory. The light and color curves are plotted in Figure 1. The
magnitudes are plotted relative to the comparison star in this figure.
There are some small irregular variations in both $B-V$ and $V-R$ color
curves.}

\IBVSTack{\vrule height12.5pt width0pt We would like to present our
thanks to the T\"{U}B\.{I}TAK National Observatory for partial
financial and equipment support. This work also was supported by
\c{C}anakkale Onsekiz Mart University Research Fund.}

\vskip-5.5pt
\reference

ESA, 1997, The Hipparcos and Tycho Catalogues, SP--1200

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